| Castilleja acuminata (Pursh) Spreng. | Synonym |  | WCSP (in review) | 
	
		| Castilleja acuminata Turcz. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja adenophora Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja affinis Hook. & Arn. | Accepted |  | WCSP (in review) | 
	
		| Castilleja affinis Benth. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja affinis var. contentiosa (J.F.Macbr.) Bacig. | Synonym |  | WCSP (in review) | 
	
		| Castilleja affinis subsp. insularis (Eastw.) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja affinis var. linariifolia (Benth.) Zeile | Synonym |  | WCSP (in review) | 
	
		| Castilleja affinis subsp. litoralis (Pennell) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja affinis var. minor A.Gray | Unresolved |  | WCSP (in review) | 
	
		| Castilleja affinis subsp. neglecta (Zeile) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja affinis var. neglecta (Zeile) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja agrestis Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja albobarbata Iltis & G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja alpicola T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja altorum Standl. & Steyerm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ambigua Hook. & Arn. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ambigua M.E.Jones [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja ambigua var. humboldtiensis (D.D. Keck) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja ambigua var. insalutata (Jeps.) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja ampliflora Rydb. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja anacapensis Dunkle | Synonym |  | WCSP (in review) | 
	
		| Castilleja andrewsii L.F.Hend. | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustata Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja angustifolia (Nutt.) G.Don | Accepted |  | WCSP (in review) | 
	
		| Castilleja angustifolia M.Martens & Galeotti [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia A.Gray [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia Gand. | Synonym |  | TRO | 
	
		| Castilleja angustifolia var. abbreviata Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia subsp. abbreviata (Fernald) Piper & Beattie | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. adenophora Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. bradburii (Nutt.) Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia subsp. bradburii (Nutt.) Piper & Beattie | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. collina (A.Nelson) Garrett | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. dubia A.Nelson | Accepted |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. flavescens (Pennell ex Edwin) N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. hispida (Benth. ex Hook.) Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia subsp. hispida (Benth. ex Hook.) Piper & Beattie | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. subcinerea (Rydb.) A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja angustifolia var. whitedii Piper | Synonym |  | WCSP (in review) | 
	
		| Castilleja annua Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja anthemidifolia Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja applegatei Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja applegatei var. breweri (Fernald) N.H.Holmgren | Synonym |  | WCSP (in review) | 
	
		| Castilleja applegatei subsp. disticha (Eastw.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja applegatei var. fragilis (Zeile) N.H.Holmgren | Synonym |  | WCSP (in review) | 
	
		| Castilleja applegatei subsp. martinii (Abrams) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja applegatei var. pallida (Eastw.) N.H.Holmgren | Synonym |  | WCSP (in review) | 
	
		| Castilleja applegatei subsp. pallida (Eastw.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja applegatei var. pinetorum (Fernald) N.H.Holmgren | Synonym |  | WCSP (in review) | 
	
		| Castilleja applegatei subsp. pinetorum (Fernald) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja applegatei var. viscida (Rydb.) Ownbey | Synonym |  | WCSP (in review) | 
	
		| Castilleja aquariensis N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja arachnoidea Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja arachnoidea subsp. schizotricha (Greenm.) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja arachnoidea subsp. shartensis (Eastw.) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja arapahoensis Daniels [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja arctica Krylov & Serg. | Accepted |  | WCSP (in review) | 
	
		| Castilleja arcuata Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja ardifera J.F.Macbr. & Payson [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja arvensis Cham. & Schltdl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja aspera Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja attenuata (A. Gray) T.I. Chuang & Heckard | Accepted |  | TRO | 
	
		| Castilleja aurantiaca Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja aurea B.L.Rob. & Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja auriculata Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja austromontana Standl. & Blumer | Accepted |  | WCSP (in review) | 
	
		| Castilleja bakeri Greene | Unresolved |  | TRO | 
	
		| Castilleja barnebyana Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja belding (Greene) Tank & J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja bella Standl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja bennittii A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja bicolor Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja blumeri Standl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja brachyantha Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja brachyantha var. subinflata E.H.Kelso | Synonym |  | WCSP (in review) | 
	
		| Castilleja bracteata Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja bradburii (Nutt.) G.Don | Synonym |  | WCSP (in review) | 
	
		| Castilleja breviflora Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja breviflora A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja brevilobata Piper | Synonym |  | WCSP (in review) | 
	
		| Castilleja brevistyla (Hoover) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja breweri Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja breweri var. pallida Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja brooksii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja brunnescens Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja bryantii Brandegee | Accepted |  | WCSP (in review) | 
	
		| Castilleja bryantii var. socorrensis (Moran) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja buffumii A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja calcicola Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja californica Abrams | Synonym |  | WCSP (in review) | 
	
		| Castilleja campestris (Benth.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja campestris var. succulenta (Hoover) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja camporum Howell | Synonym |  | WCSP (in review) | 
	
		| Castilleja candens Durand & Hilg. | Synonym |  | WCSP (in review) | 
	
		| Castilleja canescens Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja carterae Beane [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja caudata (Pennell) Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja caudata Rebrecht | Unresolved |  | TRO | 
	
		| Castilleja cerroana Edwin | Accepted |  | WCSP (in review) | 
	
		| Castilleja cervina Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja chambersii M.Egger & Meinke | Accepted |  | WCSP (in review) | 
	
		| Castilleja chiapensis Brandegee | Accepted |  | WCSP (in review) | 
	
		| Castilleja chiriquiensis Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja chlorosceptron G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja chlorotica Piper | Accepted |  | WCSP (in review) | 
	
		| Castilleja christii N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja chromosa A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja chrymactis Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja chrysantha Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ciliata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja cinerea A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja citrina Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja clementis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja clokeyi Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja coccinea (L.) Spreng. | Accepted |  | WCSP (in review) | 
	
		| Castilleja coccinea Douglas | Synonym |  | WCSP (in review) | 
	
		| Castilleja coccinea f. alba Farw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja coccinea f. lutescens Farw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja coccinea f. pallens (Michx.) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja cognata Greene [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja collina A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja communis Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja communis f. johnstoniae Standl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja confusa Greene | Synonym |  | WCSP (in review) | 
	
		| Castilleja confusa var. pubens (A.Nelson & J.F.Macbr.) A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja conzattii Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja coronopifolia Vent. | Synonym |  | WCSP (in review) | 
	
		| Castilleja covilleana Hend. | Accepted |  | WCSP (in review) | 
	
		| Castilleja crispula Piper | Synonym |  | WCSP (in review) | 
	
		| Castilleja crista-galli Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja cruenta Standl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja cryptandra Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja cryptantha Pennell & G.N.Jones | Accepted |  | WCSP (in review) | 
	
		| Castilleja ctenodonta Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ctenodonta var. altorum (Standl. & Steyerm.) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja culbertsonii Greene | Synonym |  | WCSP (in review) | 
	
		| Castilleja curticalix A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja cusickii Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja dendridion G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja densiflora (Benth.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja densiflora var. gracilis (Benth.) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja densiflora var. obispoensis (D.D. Keck) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja desertorum Geyer | Synonym |  | WCSP (in review) | 
	
		| Castilleja dissitiflora N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja disticha Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja divaricata Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja dixonii Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja dolichostylis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja douglasii Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja douglasii var. contentiosa J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja douglasii subsp. insularis (Eastw.) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja dubia (A.Nelson) A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja durangensis G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja eastwoodiana Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja ecuadorensis N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja elata Piper | Synonym |  | WCSP (in review) | 
	
		| Castilleja elegans Malte | Accepted |  | WCSP (in review) | 
	
		| Castilleja elkoensis Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja elmeri Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja elongata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja episcopalis Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja eremophila Wooton & Standl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja ewanii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja excelsa Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja exigua J.M. Egger | Unresolved |  | TRO | 
	
		| Castilleja exilis A.Nelson | Accepted |  | WCSP (in review) | 
	
		| Castilleja eximia Eastw. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja exserta (A.Heller) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja exserta Eastw. & C.F. Baker | Synonym |  | TRO | 
	
		| Castilleja exserta var. latifolia (S. Watson) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja exserta var. venusta (A. Heller) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja falcata Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja fasciculata A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja fasciculata var. inverta A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja filiflora G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja filifolia Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia L.f. | Accepted |  | WCSP (in review) | 
	
		| Castilleja fissifolia Sessé & Moç. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja fissifolia var. angustifolia Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia var. breviflora (Benth.) Wedd. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia var. divaricata (Benth.) Wedd. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia subsp. fruticosa Wedd. ex Melch. | Synonym |  | TRO | 
	
		| Castilleja fissifolia var. integrifolia (L.f.) Wedd. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia var. longifolia Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia var. nubigena (Kunth) Wedd. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia subsp. nubigena (Kunth) Wedd. ex Melch. | Synonym |  | TRO | 
	
		| Castilleja fissifolia var. pumila (Benth. ex DC) Wedd. | Synonym |  | WCSP (in review) | 
	
		| Castilleja fissifolia subsp. pumila (Benth.) Wedd. ex Melch. | Synonym |  | TRO | 
	
		| Castilleja fissifolia subsp. pumila (Benth.) Wedd. | Synonym |  | TRO | 
	
		| Castilleja flava S.Watson | Accepted |  | WCSP (in review) | 
	
		| Castilleja flava var. rustica (Piper) N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja flavescens Pennell ex Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja flavoviridis Kelso | Synonym |  | WCSP (in review) | 
	
		| Castilleja floccosa Pennell ex M.Peck [Invalid] | Synonym |  | WCSP (in review) | 
	
		| Castilleja foliolosa Hook. & Arn. | Accepted |  | WCSP (in review) | 
	
		| Castilleja franciscana Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja fraterna Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja fruticosa Moran | Accepted |  | WCSP (in review) | 
	
		| Castilleja fulgens Nutt. ex A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja fulva Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja galeata A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja galehintoniae G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja genevievana G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja glandulifera Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja glandulifera subsp. pallida (Eastw.) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja glandulosa Greenm. | Synonym |  | WCSP (in review) | 
	
		| Castilleja × gleasonii Elmer | Accepted |  | WCSP (in review) | 
	
		| Castilleja gleasonii Elmer | Synonym |  | TRO | 
	
		| Castilleja globosa Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja gloriosa Britton | Synonym |  | WCSP (in review) | 
	
		| Castilleja gonzaleziae G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja gracilis Benth. | Accepted |  | WCSP (in review) | 
	
		| Castilleja gracillima Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja grandiflora Spreng. | Synonym |  | WCSP (in review) | 
	
		| Castilleja grisea Dunkle | Accepted |  | WCSP (in review) | 
	
		| Castilleja guadalupensis Brandegee | Accepted |  | WCSP (in review) | 
	
		| Castilleja gyroloba Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja haitiensis Urb. & Ekman | Accepted |  | WCSP (in review) | 
	
		| Castilleja haydenii (A.Gray) Cockerell | Accepted |  | WCSP (in review) | 
	
		| Castilleja haydenii (A. Gray) Greene | Synonym |  | TRO | 
	
		| Castilleja helleri Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja henryae Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja hidalgensis J.M.Egger | Accepted |  | WCSP (in review) | 
	
		| Castilleja hirsuta M.Martens & Galeotti | Accepted |  | WCSP (in review) | 
	
		| Castilleja hispida Benth. ex Hook. | Accepted |  | WCSP (in review) | 
	
		| Castilleja hispida subsp. abbreviata (Fernald) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja hispida subsp. acuta Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja hispida var. acuta (Pennell) Pennell ex M.Peck | Synonym |  | WCSP (in review) | 
	
		| Castilleja hispida subsp. brevilobata (Piper) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja hoffmannii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja holmgrenii J.M.Egger | Accepted |  | WCSP (in review) | 
	
		| Castilleja hololeuca Greene | Synonym |  | WCSP (in review) | 
	
		| Castilleja hololeuca subsp. grisea (Dunkle) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja howellii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja humilis Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja hyetophila Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja hyetophila f. longiflora Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja hyparctica Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja hyperborea Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja hyssopifolia Willd. ex G.Don | Synonym |  | WCSP (in review) | 
	
		| Castilleja inconspicua A.Nelson & P.B.Kenn. | Synonym |  | WCSP (in review) | 
	
		| Castilleja inconstans Standl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja indecora Piper | Synonym |  | WCSP (in review) | 
	
		| Castilleja indivisa Engelm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja indivisa f. vivida Cory | Synonym |  | WCSP (in review) | 
	
		| Castilleja inflata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja inornata Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja integra A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja integra var. gloriosa (Britton) Cockerell | Accepted |  | WCSP (in review) | 
	
		| Castilleja integra var. gracilis Cockerell | Synonym |  | WCSP (in review) | 
	
		| Castilleja integra var. intermedia Cockerell | Synonym |  | WCSP (in review) | 
	
		| Castilleja integrifolia L.f. | Accepted |  | WCSP (in review) | 
	
		| Castilleja integrifolia Kunth [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja integrifolia Sessé & Moç. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja integrifolia var. alpigena L.O.Williams | Synonym |  | WCSP (in review) | 
	
		| Castilleja integrifolia var. chiapensis (Brandegee) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja integrifolia var. longibracteata (M. Martens & Galeotti) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja inverta (A.Nelson & J.F.Macbr.) Pennell & Ownbey | Synonym |  | WCSP (in review) | 
	
		| Castilleja irasuensis Oerst. | Accepted |  | WCSP (in review) | 
	
		| Castilleja irazuensis Oerst. | Unresolved |  | TRO | 
	
		| Castilleja jepsonii Bacig. & Heckard | Synonym |  | WCSP (in review) | 
	
		| Castilleja jiquilpana G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja jusselii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja kaibabensis N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja katakyptusa Loes. | Synonym |  | WCSP (in review) | 
	
		| Castilleja kraliana J.R.Allison | Accepted |  | WCSP (in review) | 
	
		| Castilleja kuschei Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja labiata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja lacera (Benth.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja laciniata Hook. & Arn. | Accepted |  | WCSP (in review) | 
	
		| Castilleja lanata A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja lanata subsp. hololeuca (Greene) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja lanceifolia Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja lapidicola A.Heller | Synonym |  | WCSP (in review) | 
	
		| Castilleja lapponica Gand. | Accepted |  | WCSP (in review) | 
	
		| Castilleja lapponica Gand. ex Rebrist. | Synonym |  | TRO | 
	
		| Castilleja lasiorhyncha (A.Gray) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja lassenensis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja latebracteata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifolia Hook. & Arn. | Accepted |  | WCSP (in review) | 
	
		| Castilleja latifolia subsp. carmelensis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifolia subsp. insularis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifolia subsp. mendocinensis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifolia subsp. pinnatifida Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifolia var. rubra (Pennell) J.T.Howell | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifolia var. wightii (Elmer) Zeile | Synonym |  | WCSP (in review) | 
	
		| Castilleja latifoliata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja lauta A.Nelson | Unresolved |  | WCSP (in review) | 
	
		| Castilleja laxa A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja lebgueana G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja lemmonii A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja lentii N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja leonardii Rydb. | Unresolved |  | WCSP (in review) | 
	
		| Castilleja leschkeana J.T.Howell | Synonym |  | WCSP (in review) | 
	
		| Castilleja levisecta Greenm. | Unresolved |  | TRO | 
	
		| Castilleja linariifolia Benth. | Accepted |  | WCSP (in review) | 
	
		| Castilleja linariifolia var. filiformis Daniels | Synonym |  | WCSP (in review) | 
	
		| Castilleja linariifolia f. omnipubescens Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja linariifolia var. omnipubescens (Pennell) Clokey | Synonym |  | WCSP (in review) | 
	
		| Castilleja linariifolia f. rosea Cockerell | Synonym |  | WCSP (in review) | 
	
		| Castilleja lindheimeri A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja lineariloba (Benth.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja linearis Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja lineata Greene | Accepted |  | WCSP (in review) | 
	
		| Castilleja linifolia N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja linoides A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja lithospermoides Kunth | Synonym |  | WCSP (in review) | 
	
		| Castilleja lithospermoides var. flava S.Watson | Synonym |  | WCSP (in review) | 
	
		| Castilleja lithospermoides var. major Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja lithospermoides var. pastorei Hicken | Synonym |  | WCSP (in review) | 
	
		| Castilleja litoralis Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja longibracteata M.Martens & Galeotti | Accepted |  | WCSP (in review) | 
	
		| Castilleja longiflora Kunze | Accepted |  | WCSP (in review) | 
	
		| Castilleja longispica A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja ludoviciana Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja lutea A.Heller | Synonym |  | WCSP (in review) | 
	
		| Castilleja luteovirens Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja lutescens (Greenm.) Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja lutescens (Greenm.) Piper | Synonym |  | TRO | 
	
		| Castilleja macrocarpa Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja macrostigma S.Watson | Accepted |  | WCSP (in review) | 
	
		| Castilleja magna Rydb. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja magnistylis Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja martinii Abrams | Synonym |  | WCSP (in review) | 
	
		| Castilleja martinii var. clokeyi (Pennell) N.H.Holmgren | Synonym |  | WCSP (in review) | 
	
		| Castilleja martinii subsp. ewanii (Eastw.) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja martinii var. ewanii (Eastw.) N.H.Holmgren | Synonym |  | WCSP (in review) | 
	
		| Castilleja mcvaughii N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja mearnsii Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja mendocinensis (Eastw.) Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja meridensis Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja mexiae Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja mexicana (Hemsl.) A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja miniata Douglas ex Hook. | Accepted |  | WCSP (in review) | 
	
		| Castilleja miniata var. alpina Suksd. | Synonym |  | WCSP (in review) | 
	
		| Castilleja miniata var. chromosa (A.Nelson) Garrett | Synonym |  | WCSP (in review) | 
	
		| Castilleja miniata var. crispula (Piper) A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja miniata var. dixonii (Fernald) A.Nelson & J.F.Gmel. | Accepted |  | WCSP (in review) | 
	
		| Castilleja miniata subsp. dixonii (Fernald) Kartesz | Synonym |  | WCSP (in review) | 
	
		| Castilleja miniata subsp. elata (Piper) Munz | Accepted |  | WCSP (in review) | 
	
		| Castilleja miniata var. fulva (Pennell) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja miniata var. oblongifolia (A.Gray) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja minor (A. Gray) A. Gray | Accepted |  | TRO | 
	
		| Castilleja minor var. exilis (A. Nelson) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja minor subsp. spiralis (Jeps.) T.I. Chuang & Heckard | Synonym |  | TRO | 
	
		| Castilleja minor var. spiralis (Jeps.) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja mogollonica Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja mollis Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja montana Congdon | Synonym |  | WCSP (in review) | 
	
		| Castilleja montigena Heckard | Synonym |  | WCSP (in review) | 
	
		| Castilleja moranensis Kunth | Accepted |  | WCSP (in review) | 
	
		| Castilleja moranensis var. cinerascens (Eastw.) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja muelleri Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja multisecta A.Nelson [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja multisecta Eastw. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja muscipula Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja muscipula var. angustifolia Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja muscipula var. armeniaca Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja nana Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja neglecta Zeile | Synonym |  | WCSP (in review) | 
	
		| Castilleja nelsonii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja nervata Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja nervosa A. Nelson | Unresolved |  | TRO | 
	
		| Castilleja nevadensis Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja nitricola Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja nivea Pennell & Ownbey | Accepted |  | WCSP (in review) | 
	
		| Castilleja nivibractea G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja nubigena Kunth | Accepted |  | WCSP (in review) | 
	
		| Castilleja nubigena var. pumila Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja nubigena x fissifolia | Accepted |  | TRO | 
	
		| Castilleja nubigens Kunth | Unresolved |  | TRO | 
	
		| Castilleja oblongifolia A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja obovata Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja obtusiloba Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja occidentalis Torr. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ochracea Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja olgae A.P.Khokhr. | Accepted |  | WCSP (in review) | 
	
		| Castilleja olympica G.N.Jones | Synonym |  | WCSP (in review) | 
	
		| Castilleja ophiocephala Tank & J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja oregonensis Gand. | Unresolved |  | WCSP (in review) | 
	
		| Castilleja oreopola Greenm. | Synonym |  | WCSP (in review) | 
	
		| Castilleja oreopola subsp. albida Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja oreopola subsp. olympica Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja oreopola var. subintegra Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja oresbia Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja organorum Standl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja orizabae Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja ornata Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ortegae Standl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja ownbeyana Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallescens (A.Gray) Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pallescens var. inverta (A.Nelson & J.F.Macbr.) Edwin | Accepted |  | WCSP (in review) | 
	
		| Castilleja pallida (L.) Kunth | Accepted |  | WCSP (in review) | 
	
		| Castilleja pallida (L.) Spreng. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. acuminata (Pursh) MacMill. | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. alpina Porter | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. angustata (Eastw.) B.L.Rob. & Seaton | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. auricoma Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. auricoma (Pennell) B.Boivin | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. borealis Pohle ex Rebrist. | Synonym |  | TRO | 
	
		| Castilleja pallida var. camporum (Howell) Greenm. | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. caudata Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. caudata (Pennell) B.Boivin | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. dahurica Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. elegans (Malte) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. elegans (Malte) B.Boivin | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. haydenii A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. hyparctica (Rebr.) Á.Löve & D.Löve | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. hyparctica (Rebrist.) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja pallida subsp. lapponica (Gand.) Á.Löve & D.Löve | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. lapponica (Gand. ex Rebrist.) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja pallida var. lutescens Greenm. | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. mexiae Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. miniata (Douglas ex Hook.) A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. pavlovii (Rebr.) Á.Löve & D.Löve | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. rubra (Drobow) | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. saccata Pennell | Synonym |  | TRO | 
	
		| Castilleja pallida var. saccata (Pennell) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja pallida var. septentrionalis (Lindl.) A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. septentrionalis (Lindl.) Scoggan | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida f. tincta (Cockerell) Cockerell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida subsp. typica Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pallida var. unalaschcensis Cham. & Schltdl. | Unresolved |  | WCSP (in review) | 
	
		| Castilleja pallida var. unalaschkensis Cham. & Schltdl. | Synonym |  | TRO | 
	
		| Castilleja pallida var. yukonis (Pennell) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja palmeri Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pannosa Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja papilionacea G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja parviflora Bong. | Accepted |  | WCSP (in review) | 
	
		| Castilleja parviflora var. albida (Pennell) Ownbey | Accepted |  | WCSP (in review) | 
	
		| Castilleja parviflora var. californica (Abrams) Zeile | Synonym |  | WCSP (in review) | 
	
		| Castilleja parviflora var. douglasii (Benth.) Jeps. | Synonym |  | WCSP (in review) | 
	
		| Castilleja parviflora var. olympica (G.N.Jones) Ownbey | Accepted |  | WCSP (in review) | 
	
		| Castilleja parviflora var. oreopola (Greenm.) Ownbey | Accepted |  | WCSP (in review) | 
	
		| Castilleja parvula Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja parvula var. revealii (N.Holmgren) N.D.Atwood | Synonym |  | WCSP (in review) | 
	
		| Castilleja patriotica Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja patriotica var. blumeri (Standl.) Kearney & Peebles | Synonym |  | WCSP (in review) | 
	
		| Castilleja pavlovii Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja payneae Eastw. | Unresolved |  | WCSP (in review) | 
	
		| Castilleja peckiana Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja pecten Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja pectinata M.Martens & Galeotti | Accepted |  | WCSP (in review) | 
	
		| Castilleja pectinata var. purpusii (Brandegee) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja pediaca Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja peirsonii Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja perelegans G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja peruviana T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja pilifera A.Nelson | Synonym |  | WCSP (in review) | 
	
		| Castilleja pilosa (S.Watson) Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pilosa var. inverta (A.Nelson & J.F.Macbr.) Greenm. | Synonym |  | WCSP (in review) | 
	
		| Castilleja pilosa subsp. jusselii (Eastw.) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja pilosa var. longispica (A.Nelson) N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja pilosa var. steenensis (Pennell) N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja pinetorum Fernald | Synonym |  | WCSP (in review) | 
	
		| Castilleja pinetorum var. fragilis Zeile | Synonym |  | WCSP (in review) | 
	
		| Castilleja pinnata Sessé & Moç. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja plagiotoma A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja polytoma Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja porphyrosceptron G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja × porterae Cockerell | Accepted |  | WCSP (in review) | 
	
		| Castilleja praeterita Heckard & Bacig. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pratensis A.Heller | Synonym |  | WCSP (in review) | 
	
		| Castilleja pringlei Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja profunda T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja pruinosa Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja pruinosa subsp. gleasonii (Elmer) Munz | Unresolved |  | WCSP (in review) | 
	
		| Castilleja pseudohyperborea Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pseudopallescens Edwin | Accepted |  | WCSP (in review) | 
	
		| Castilleja psittacina (Eastw.) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pterocaulon N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja puberula Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pulchella Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja pulchella var. acutina E.H.Kelso | Synonym |  | WCSP (in review) | 
	
		| Castilleja pulcherrima Sessé & Moç. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja pumicicola Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja pumila (Benth.) Wedd. | Accepted |  | WCSP (in review) | 
	
		| Castilleja purpurascens Greenm. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja purpurascens Rydb. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja purpurea (Nutt.) G.Don | Accepted |  | WCSP (in review) | 
	
		| Castilleja purpurea var. citrina (Pennell) Shinners | Accepted |  | WCSP (in review) | 
	
		| Castilleja purpurea f. corallina Waterf. | Synonym |  | WCSP (in review) | 
	
		| Castilleja purpurea var. lindheimeri (A.Gray) Shinners | Accepted |  | WCSP (in review) | 
	
		| Castilleja purpusii Brandegee | Accepted |  | WCSP (in review) | 
	
		| Castilleja pyramidalis Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja quibellii Beane [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja quiexobrensis G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja quirosii Standl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja racemosa (Breedlove & Heckard) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja raupii Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja raupii subsp. ursina Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja remota Greene | Synonym |  | WCSP (in review) | 
	
		| Castilleja retrorsa Standl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja revealii N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja rhexifolia Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja rhexifolia var. pubens A.Nelson & J.F.Macbr. | Synonym |  | WCSP (in review) | 
	
		| Castilleja rhexifolia var. sulphurea (Rydb.) N.D.Atwood | Synonym |  | WCSP (in review) | 
	
		| Castilleja rhizomata N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja rigida Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja roei Crosswh. | Accepted |  | WCSP (in review) | 
	
		| Castilleja roseana Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja rubicundula (Jeps.) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja rubicundula var. lithospermoides (Benth.) J.M. Egger | Accepted |  | TRO | 
	
		| Castilleja rubida Piper | Accepted |  | WCSP (in review) | 
	
		| Castilleja rubida var. monoensis (Jeps.) Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja rubiginosa J.F.Macbr. & Payson [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja rubra (Drobow) Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja rupicola Piper ex Fernald | Accepted |  | WCSP (in review) | 
	
		| Castilleja rustica Piper | Synonym |  | WCSP (in review) | 
	
		| Castilleja salsuginosa N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja saltensis Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja salticola Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja scabrida Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja scabrida var. barnebyana (Eastw.) N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja scabridula Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja schaffneri Hemsl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja schaffneri var. cinerascens Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja schizotricha Greenm. | Accepted |  | WCSP (in review) | 
	
		| Castilleja schrenkii Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja scorzonerifolia Kunth | Accepted |  | WCSP (in review) | 
	
		| Castilleja seibertii Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja septentrionalis Lindl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja septentrionalis var. micmacorum J.Rousseau | Synonym |  | WCSP (in review) | 
	
		| Castilleja serrata Loudon [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja sessiliflora Pursh | Accepted |  | WCSP (in review) | 
	
		| Castilleja sessiliflora subsp. betheli Cockerell | Synonym |  | WCSP (in review) | 
	
		| Castilleja sessiliflora f. purpurina Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja setosa Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja shastense Eastw. | Unresolved |  | TRO | 
	
		| Castilleja sibirica Lindl. | Synonym |  | WCSP (in review) | 
	
		| Castilleja socorrensis Moran | Accepted |  | WCSP (in review) | 
	
		| Castilleja speciosa M.Martens & Galeotti | Synonym |  | WCSP (in review) | 
	
		| Castilleja sphaerostigma Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja spiralis Jeps. | Unresolved |  | WCSP (in review) | 
	
		| Castilleja spiranthoides Standl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja steenensis Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja stenantha A.Gray | Unresolved |  | WCSP (in review) | 
	
		| Castilleja stenantha subsp. spiralis (Jeps.) Munz | Unresolved |  | WCSP (in review) | 
	
		| Castilleja stenophylla M.E.Jones | Accepted |  | WCSP (in review) | 
	
		| Castilleja steyermarkii Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja stipifolia G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja stricta Benth. | Synonym |  | WCSP (in review) | 
	
		| Castilleja stricta Rydb. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja subalpina Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja subcinerea Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja subinclusa Greene | Accepted |  | WCSP (in review) | 
	
		| Castilleja subinclusa var. franciscana (Pennell) G.L.Nesom | Synonym |  | WCSP (in review) | 
	
		| Castilleja subinclusa subsp. franciscana (Pennell) T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja subinclusa var. jepsonii (Bacig. & Heckard) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja subpurpurascens Rydb. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja suksdorfii A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja sulphurea Rydb. | Accepted |  | WCSP (in review) | 
	
		| Castilleja taedifera Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja talamancensis N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja tancitaroana G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja tapeinoclada Loes. | Accepted |  | WCSP (in review) | 
	
		| Castilleja tapeinoclada var. hirta Loes. | Synonym |  | WCSP (in review) | 
	
		| Castilleja tapeinoclada var. subglabra Loes. | Synonym |  | WCSP (in review) | 
	
		| Castilleja tayloriorum N.H.Holmgren | Accepted |  | WCSP (in review) | 
	
		| Castilleja tenella Rebrist. | Accepted |  | WCSP (in review) | 
	
		| Castilleja tenuiflora Benth. | Accepted |  | WCSP (in review) | 
	
		| Castilleja tenuiflora var. tancitaroana (G.L. Nesom) J.M. Egger | Synonym |  | TRO | 
	
		| Castilleja tenuiflora var. xylorrhiza (Eastw.) G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja tenuifolia M.Martens & Galeotti | Accepted |  | WCSP (in review) | 
	
		| Castilleja tenuis (A. Heller) T.I. Chuang & Heckard | Accepted |  | TRO | 
	
		| Castilleja thompsonii Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja toluccensis Kunth | Accepted |  | WCSP (in review) | 
	
		| Castilleja toluccensis Cham. & Schltdl. [Illegitimate] | Synonym |  | WCSP (in review) | 
	
		| Castilleja tomentosa A.Gray | Synonym |  | WCSP (in review) | 
	
		| Castilleja tortifolia Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja trainii Edwin | Synonym |  | WCSP (in review) | 
	
		| Castilleja trifida Willd. ex Walp. | Synonym |  | WCSP (in review) | 
	
		| Castilleja trifida Willd. ex Melch. | Synonym |  | TRO | 
	
		| Castilleja trinervis Rydb. | Unresolved |  | WCSP (in review) | 
	
		| Castilleja trisecta Greene | Synonym |  | WCSP (in review) | 
	
		| Castilleja tristis W. Wight ex Standl. | Unresolved |  | TRO | 
	
		| Castilleja tristis var. pubens W. Wight ex Standl. | Synonym |  | TRO | 
	
		| Castilleja trujillensis Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja tweedyi Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja uliginosa Eastw. | Accepted |  | WCSP (in review) | 
	
		| Castilleja unalaschcensis (Cham. & Schltdl.) Malte | Accepted |  | WCSP (in review) | 
	
		| Castilleja vadosa T.I.Chuang & Heckard | Accepted |  | WCSP (in review) | 
	
		| Castilleja variabilis Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja variocolorata A.P.Khokhr. | Accepted |  | WCSP (in review) | 
	
		| Castilleja venusta Rzed. | Accepted |  | WCSP (in review) | 
	
		| Castilleja victoriae Fairbarns & J.M.Egger | Accepted |  | WCSP (in review) | 
	
		| Castilleja villicaulis Pennell & Ownbey | Synonym |  | WCSP (in review) | 
	
		| Castilleja villosa Rydb. [Unplaced] | Unresolved |  | WCSP (in review) | 
	
		| Castilleja villosissima Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja virgata Dombey ex Wedd. | Accepted |  | WCSP (in review) | 
	
		| Castilleja virgata (Wedd.) Edwin | Unresolved |  | TRO | 
	
		| Castilleja virgatoides Edwin | Unresolved |  | TRO | 
	
		| Castilleja virgayoides Edwin | Accepted |  | WCSP (in review) | 
	
		| Castilleja viscida Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja viscidula A.Gray | Accepted |  | WCSP (in review) | 
	
		| Castilleja vreelandii Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja wallowensis Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja wherryana Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja wightii Elmer | Accepted |  | WCSP (in review) | 
	
		| Castilleja wightii subsp. anacapensis (Dunkle) Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja wightii subsp. inflata (Pennell) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja wightii subsp. litoralis (Pennell) Munz | Synonym |  | WCSP (in review) | 
	
		| Castilleja wightii subsp. rubra Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja williamsii Pennell | Synonym |  | WCSP (in review) | 
	
		| Castilleja wootonii Standl. | Accepted |  | WCSP (in review) | 
	
		| Castilleja wyomingensis Rydb. | Synonym |  | WCSP (in review) | 
	
		| Castilleja xanthotricha Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja xylorrhiza Eastw. | Synonym |  | WCSP (in review) | 
	
		| Castilleja yukonis Pennell | Accepted |  | WCSP (in review) | 
	
		| Castilleja zempoaltepetlensis G.L.Nesom | Accepted |  | WCSP (in review) | 
	
		| Castilleja zionis Eastw. | Synonym |  | WCSP (in review) |