| Horkelia argyrocoma Rydb. |
Unresolved |
 |
TRO |
| Horkelia arrhiza (L.) Druce |
Synonym |
 |
WCSP |
| Horkelia baileyi (S. Watson) Rydb. |
Accepted |
 |
TRO |
| Horkelia baileyi var. setosa (S. Watson) Rydb. |
Synonym |
 |
TRO |
| Horkelia beneolens A. Nelson & J.F. Macbr. |
Synonym |
 |
TRO |
| Horkelia bernardina Rydb. |
Synonym |
 |
TRO |
| Horkelia bolanderi A. Gray |
Synonym |
 |
TRO |
| Horkelia bolanderi subsp. clevelandii (Greene) D.D. Keck |
Unresolved |
 |
TRO |
| Horkelia bolanderi var. marinensis Elmer |
Synonym |
 |
TRO |
| Horkelia bolanderi subsp. parryi (S. Watson) D.D. Keck |
Unresolved |
 |
TRO |
| Horkelia bolanderi var. parryi S. Watson |
Synonym |
 |
TRO |
| Horkelia brevibracteata Wiggins |
Synonym |
 |
TRO |
| Horkelia brownii Rydb. |
Synonym |
 |
TRO |
| Horkelia californica Cham. & Schltdl. |
Synonym |
 |
TRO |
| Horkelia californica var. cuneata (Lindl.) A. Gray |
Synonym |
 |
TRO |
| Horkelia californica subsp. dissita (Crum ex Jeps.) Ertter |
Unresolved |
 |
TRO |
| Horkelia californica var. elata (Greene) Ertter & Reveal |
Unresolved |
 |
TRO |
| Horkelia californica subsp. frondosa (Greene) Ertter |
Unresolved |
 |
TRO |
| Horkelia californica var. frondosa (Greene) Ertter & Reveal |
Unresolved |
 |
TRO |
| Horkelia californica var. sericea A. Gray |
Synonym |
 |
TRO |
| Horkelia campestris (M.E. Jones) Rydb. |
Synonym |
 |
TRO |
| Horkelia capitata Lindl. |
Synonym |
 |
TRO |
| Horkelia caruifolia Rydb. ex Howell |
Synonym |
 |
TRO |
| Horkelia chaetophora Rydb. |
Synonym |
 |
TRO |
| Horkelia chandleri Rydb. |
Synonym |
 |
TRO |
| Horkelia clevelandii (Greene) Rydb. |
Accepted |
 |
TRO |
| Horkelia clevelandii var. brevibracteata (Wiggins) Ertter & Reveal |
Accepted |
 |
TRO |
| Horkelia congdonis Rydb. |
Synonym |
 |
TRO |
| Horkelia congesta Douglas ex Hook. |
Synonym |
 |
TRO |
| Horkelia congesta subsp. nemorosa D.D. Keck |
Synonym |
 |
TRO |
| Horkelia congesta var. nemorosa (D.D. Keck) M. Peck |
Synonym |
 |
TRO |
| Horkelia cuneata Lindl. |
Synonym |
 |
TRO |
| Horkelia cuneata subsp. puberula (Rydb.) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia cuneata var. puberula (Rydb.) Ertter & Reveal |
Unresolved |
 |
TRO |
| Horkelia cuneata subsp. sericea (A. Gray) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia cuneata var. sericea (A. Gray) Ertter & Reveal |
Unresolved |
 |
TRO |
| Horkelia daucifolia (Greene) Rydb. |
Accepted |
 |
TRO |
| Horkelia daucifolia var. caruifolia (Rydb. ex Howell) Ertter & Reveal |
Accepted |
 |
TRO |
| Horkelia daucifolia var. indicta (Jeps.) Ertter & Reveal |
Accepted |
 |
TRO |
| Horkelia daucifolia subsp. latior D.D. Keck |
Synonym |
 |
TRO |
| Horkelia elata (Greene) Rydb. |
Synonym |
 |
TRO |
| Horkelia eremica (Coville) Rydb. |
Synonym |
 |
TRO |
| Horkelia flavescens Rydb. |
Synonym |
 |
TRO |
| Horkelia frondosa (Greene) Rydb. |
Synonym |
 |
TRO |
| Horkelia fusca Lindl. |
Synonym |
 |
TRO |
| Horkelia fusca var. brownii (Rydb.) Ertter & Reveal |
Unresolved |
 |
TRO |
| Horkelia fusca subsp. capitata (Lindl.) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia fusca var. capitata (Lindl.) M. Peck |
Synonym |
 |
TRO |
| Horkelia fusca subsp. filicoides (Crum) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia fusca var. filicoides (Crum) M. Peck |
Unresolved |
 |
TRO |
| Horkelia fusca subsp. parviflora (Nutt. ex Hook. & Arn.) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia fusca var. parviflora (Nutt. ex Hook. & Arn.) Wawra |
Synonym |
 |
TRO |
| Horkelia fusca subsp. pseudocapitata (Rydb. ex Howell) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia fusca var. pseudocapitata (Rydb. ex Howell) M. Peck |
Unresolved |
 |
TRO |
| Horkelia fusca subsp. tenella (S. Watson) D.D. Keck |
Unresolved |
 |
TRO |
| Horkelia fusca var. tenella S. Watson |
Synonym |
 |
TRO |
| Horkelia fusca var. tenuiloba Torr. |
Synonym |
 |
TRO |
| Horkelia glandulosa Eastw. |
Unresolved |
 |
TRO |
| Horkelia gordonii Hook. |
Synonym |
 |
TRO |
| Horkelia gordonii var. alpicola (Rydb. ex Howell) Rydb. |
Synonym |
 |
TRO |
| Horkelia gordonii var. megalopetala Rydb. |
Synonym |
 |
TRO |
| Horkelia hendersonii Howell |
Synonym |
 |
TRO |
| Horkelia hirsuta Lindl. |
Unresolved |
 |
TRO |
| Horkelia hispidula Rydb. |
Synonym |
 |
TRO |
| Horkelia howellii (Greene) Rydb. |
Accepted |
 |
TRO |
| Horkelia integrifolia Rydb. |
Unresolved |
 |
TRO |
| Horkelia kelloggii Greene |
Synonym |
 |
TRO |
| Horkelia kingii (S. Watson) Rydb. |
Accepted |
 |
TRO |
| Horkelia laxiflora (Drew) Rydb. |
Accepted |
 |
TRO |
| Horkelia lycopodioides (A. Gray) Rydb. |
Synonym |
 |
TRO |
| Horkelia marinensis (Elmer) Crum |
Synonym |
 |
TRO |
| Horkelia micheneri (Greene) Rydb. |
Accepted |
 |
TRO |
| Horkelia mollis Eastw. |
Synonym |
 |
TRO |
| Horkelia muirii (A. Gray) Rydb. |
Accepted |
 |
TRO |
| Horkelia multifoliolata Torr. |
Synonym |
 |
TRO |
| Horkelia mutabilis Brandegee |
Synonym |
 |
TRO |
| Horkelia myriophylla Greene |
Unresolved |
 |
TRO |
| Horkelia parryi Greene |
Synonym |
 |
TRO |
| Horkelia parryi (S. Watson) Rydb. |
Synonym |
 |
TRO |
| Horkelia parviflora Nutt. ex Hook. & Arn. |
Synonym |
 |
TRO |
| Horkelia pickeringii (Torr. ex A. Gray) Rydb. |
Accepted |
 |
TRO |
| Horkelia pinetorum (Coville) Rydb. |
Synonym |
 |
TRO |
| Horkelia platycalyx Rydb. |
Unresolved |
 |
TRO |
| Horkelia platypetala Rydb. |
Unresolved |
 |
TRO |
| Horkelia pseudocapitata Rydb. ex Howell |
Synonym |
 |
TRO |
| Horkelia puberula Rydb. |
Synonym |
 |
TRO |
| Horkelia pulchra Rydb. |
Unresolved |
 |
TRO |
| Horkelia purpurascens S. Watson |
Synonym |
 |
TRO |
| Horkelia purpurascens subsp. congdonis (Rydb.) Abrams |
Unresolved |
 |
TRO |
| Horkelia purpurascens var. pinetorum (Coville) Smiley |
Unresolved |
 |
TRO |
| Horkelia pygmaea (A. Gray) Rydb. |
Synonym |
 |
TRO |
| Horkelia rydbergii Elmer |
Unresolved |
 |
TRO |
| Horkelia sabulosa (M.E. Jones) L.O. Williams |
Synonym |
 |
TRO |
| Horkelia saxosa (Lemmon ex Greene) Rydb. |
Synonym |
 |
TRO |
| Horkelia scandularis Rydb. |
Synonym |
 |
TRO |
| Horkelia sericata S. Watson |
Synonym |
 |
TRO |
| Horkelia sericea (A. Gray) Rydb. |
Synonym |
 |
TRO |
| Horkelia sericoleuca Rydb. |
Synonym |
 |
TRO |
| Horkelia shockleyi (S. Watson) Rydb. |
Synonym |
 |
TRO |
| Horkelia tenella (S. Watson) Rydb. |
Synonym |
 |
TRO |
| Horkelia tenuiloba (Torr.) A. Gray |
Synonym |
 |
TRO |
| Horkelia tenuisecta Rydb. |
Synonym |
 |
TRO |
| Horkelia tilingii Regel |
Synonym |
 |
TRO |
| Horkelia tridentata Torr. |
Synonym |
 |
TRO |
| Horkelia tridentata subsp. flavescens (Rydb.) D.D. Keck |
Synonym |
 |
TRO |
| Horkelia tridentata var. flavescens (Rydb.) Ertter & Reveal |
Unresolved |
 |
TRO |
| Horkelia truncata Rydb. |
Unresolved |
 |
TRO |
| Horkelia tularensis (J.T. Howell) Munz |
Accepted |
 |
TRO |
| Horkelia tweedyi (Rydb.) A. Nelson & J.F. Macbr. |
Synonym |
 |
TRO |
| Horkelia utahensis (S. Watson) Rydb. |
Accepted |
 |
TRO |
| Horkelia webberi (A. Gray) Rydb. |
Accepted |
 |
TRO |
| Horkelia wilderae Parish |
Unresolved |
 |
TRO |
| Horkelia yadonii Ertter |
Unresolved |
 |
TRO |