| Houlletia antioquensis (André) Ames & Nash |
Synonym |
 |
WCSP |
| Houlletia boliviana Schltr. |
Synonym |
 |
WCSP |
| Houlletia brocklehurstiana Lindl. |
Accepted |
 |
WCSP |
| Houlletia buchtienii Kraenzl. |
Synonym |
 |
WCSP |
| Houlletia chrysantha Linden & André |
Synonym |
 |
WCSP |
| Houlletia clarae Schltr. |
Synonym |
 |
WCSP |
| Houlletia conspersa P.Ortiz |
Accepted |
 |
WCSP |
| Houlletia juruenensis Hoehne |
Synonym |
 |
WCSP |
| Houlletia kalbreyeriana Kraenzl. |
Synonym |
 |
WCSP |
| Houlletia landsbergii Linden & Rchb.f. |
Synonym |
 |
WCSP |
| Houlletia lowiana Rchb.f. |
Accepted |
 |
WCSP |
| Houlletia luteoflora Rojas Acosta [Unplaced] |
Unresolved |
 |
WCSP |
| Houlletia odoratissima Linden ex Lindl. & Paxton |
Accepted |
 |
WCSP |
| Houlletia odoratissima var. antioquensis André |
Synonym |
 |
WCSP |
| Houlletia odoratissima f. antioquiensis (André) O.Gruss & M.Wolff |
Synonym |
 |
WCSP |
| Houlletia odoratissima var. macrosepala Regel |
Synonym |
 |
WCSP |
| Houlletia odoratissima var. xanthina Rchb.f. |
Synonym |
 |
WCSP |
| Houlletia odoratissima f. xanthina (Rchb.f.) O.Gruss & M.Wolff |
Synonym |
 |
WCSP |
| Houlletia picta Linden & Rchb.f. |
Synonym |
 |
WCSP |
| Houlletia roraimensis Rolfe |
Accepted |
 |
WCSP |
| Houlletia sanderi Rolfe |
Accepted |
 |
WCSP |
| Houlletia stapeliiflora Brongn. |
Synonym |
 |
WCSP |
| Houlletia stapelioides Brongn. ex Rchb.f. |
Synonym |
 |
WCSP |
| Houlletia tigrina Linden ex Lindl. |
Accepted |
 |
WCSP |
| Houlletia unguiculata Schltr. |
Accepted |
 |
WCSP |
| Houlletia vittata Lindl. |
Synonym |
 |
WCSP |
| Houlletia wallisii Linden & Rchb.f. |
Accepted |
 |
WCSP |
| Houlletia wallisii var. hennisiana Schltr. |
Synonym |
 |
WCSP |