| Taxon | Collector | Location | Type Status | Barcode | |
|---|---|---|---|---|---|
| Senna cana var. phyllostegia H.S.Irwin & Barneby | E. Pereira 9658 23 Jan 1965 | Brazil. Bahia. Entre Itiruçú e Maracás. | holotype | 4848 |  |
| Senna acuruensis var. interjecta H.S.Irwin & Barneby | L. Duarte 446 18 Jul 1964 | Brazil. Bahia. 25 km de Salgueiro. | isotype | 4838 |  |
| Senna roemeriana (Scheele) H.S.Irwin & Barneby | R. T. Clausen 7649 06 May 1949 | United States of America. Texas. Bell Co. 1 mile south of Temple. | 1582486 |  | |
| Senna silvestris var. guaranitica (Chodat & Hassl.) H.S.Irwin & Barneby | O. dos S. Ribas 2425 with L. B. S. Pereira, 02 Feb 1998 | Brazil. Mato Grosso do Sul. (mun. Guia Lopes da Laguna). Rod. MS 382, 20 km NW de Guia Lopes da Laguna. | 00469881 |  | |
| Senna pendula var. meticola H.S.Irwin & Barneby | J. J. Wurdack 39964 with J. V. Monachino, 17 Dec 1955 | Venezuela. Apure. Around E outskirts of Puerto Paez, Río Orinoco at mouth of Río Meta. | holotype | 4877 |  |
| Senna roemeriana (Scheele) H.S.Irwin & Barneby | L. C. Higgins 23812 25 Jun 2002 | United States of America. New Mexico. Socorro Co. 18 miles west of Socorro along Hwy 60. | 1582499 |  | |
| Senna spectabilis (DC.) H.S.Irwin & Barneby | D. E. Atha 862 with T. A. Zanoni, 30 Nov 1994 | Puerto Rico. Hormigueros. Rte 346, 0.5km N of Rte 345. | 00040793 |  | |
| Senna septemtrionalis (Viv.) H.S.Irwin & Barneby | J. S. Hall 7909 with Susan M. Bockus, 25 Aug 1976 | Nicaragua. Matagalpa. Santa María de Ostuma, N of Matagalpa. | 658423 |  | |
| Senna x floribunda (Cav.) H.S.Irwin & Barneby | W. E. Hess 1425 05 May 1913 | Puerto Rico. Monte Alegrillo. | 00658425 |  | |
| Senna roemeriana (Scheele) H.S.Irwin & Barneby | R. C. Barneby 14459 15 Jun 1966 | United States of America. New Mexico. Guadalupe Co. Pecos River near Dilia. | 1582519 |  | |
| Senna neglecta (Vogel) H.S.Irwin & Barneby var. neglecta | J. E. Leite 2366 Jan 1943 | Brazil. Rio Grande do Sul. Estado do Rio Grando do Sul. Sao Salvador. | 515555 |  | |
| Senna nitida (Rich.) H.S.Irwin & Barneby | D. E. Atha 826 with T. A. Zanoni, 24 Nov 1994 | Puerto Rico. Caguas. Bo. Borin, Rte 179, 16.9km N of Guayama. | 00040769 |  | |
| Senna quinquangulata var. meizonoloba H.S.Irwin & Barneby | J. B. Walker 1817 with N. Yakimov, 05 Feb 1996 | United States of America. Florida. Miami-Dade Co. Coral Gables. Fairchild Tropical Garden, Plot #185. | 43665 |  | |
| Senna roemeriana (Scheele) H.S.Irwin & Barneby | N. H. Holmgren 7413 with Patricia K. Holmgren, 26 Aug 1973 | United States of America. New Mexico. Lincoln Co. North side of Capitan Mountains, New Mexico route 48, 12 airline miles east of Encinoso. | 1582522 |  | |
| Senna tropica (Vell.) H.S.Irwin & Barneby | L. Riedel 1291 Apr 1833 | Brazil. Rio de Janeiro. In callim. umbr. pe. Pertininga. | 00470069 |  | |
| Senna tropica (Vell.) H.S.Irwin & Barneby | A. P. Duarte 1503 12 Oct 1948 | Brazil. Rio de Janeiro. Represa do Xerem. | 00470065 |  | |
| Senna tropica (Vell.) H.S.Irwin & Barneby | E. Pereira 4351 with Sucre e Duarte, 01 Oct 1958 | Brazil. Rio de Janeiro. Estado de Guanabara, Represa do Comarim, Jacarepaguá. | 00470073 |  | |
| Senna pallida var. shreveana H.S.Irwin & Barneby | F. Shreve 6139 02 Mar 1933 | Mexico. Sonora. 7 mi NE of Cajeme. | holotype | 4825 |  |
| Senna chrysocarpa (Desv.) H.S.Irwin & Barneby | R. A. A. Oldeman B4083 27 Aug 1971 | French Guiana. Saint-Laurent-du-Maroni. Layon Belvédère - Région de Saül. | |||
| Senna chrysocarpa (Desv.) H.S.Irwin & Barneby | N. Marshall 168 24 Aug 1987 | French Guiana. Saint-Laurent-du-Maroni. Bourg de Saül - Région de Saül. |