| Taxon | Collector | Location | Type Status | Barcode | |
|---|---|---|---|---|---|
| Senna roemeriana (Scheele) H.S.Irwin & Barneby | Biltmore Herbarium 6955a 25 Jun 1903 | United States of America. Texas. Marble Falls. | 1582470 |  | |
| Senna hirsuta var. leptocarpa (Benth.) H.S.Irwin & Barneby | L. Riedel 1291 with Lund, Apr 1833 | Brazil. Rio de Janeiro. Perto Pertininga. | 582883 |  | |
| Senna roemeriana (Scheele) H.S.Irwin & Barneby | J. Reverchon s.n. Jun 1877 | United States of America. Texas. Dallas. | 1582472 |  | |
| Senna guatemalensis var. calcarea H.S.Irwin & Barneby | J. R. Sullivan 548 22 Jun 1971 | Mexico. Tamaulipas. Municipio de Gómez Farias. Sierra de Guatemala. Alt. 4800-5700 ft. | holotype | 4815 |  |
| Senna | P. Romero 4 with Daniel E. Atha & Benjamin Poulter, 09 Apr 1999 | Belize. Cayo. Side of Western Highway, behind (west) airstrip of BDF camp west of Central Farm. 100 yards West of mile 63. | |||
| Senna mucronifera (Benth.) H.S.Irwin & Barneby | L. Riedel 20 with B. Luschnatt, Feb 1934 | Brazil. São Paulo. Ytú. | 470528 |  | |
| Senna rugosa (G.Don) H.S.Irwin & Barneby | S. M. de Faria 1917 with Eduardo Matias de Souza, 04 Oct 1999 | Brazil. Natal BR 251. 150 km de Aracaju - Divisa Alegre - Montes Claros. | 00469693 |  | |
| Senna rugosa (G.Don) H.S.Irwin & Barneby | J. Mattos 16304 with N. Mattos, 04 Apr 1974 | Brazil. São Paulo. Peto de Pinhal. | 469778 |  | |
| Senna rugosa (G.Don) H.S.Irwin & Barneby | L. Riedel 1947 Jan-Mar 1834 | Brazil. São Paulo. St. Carlos et Ypanema. | 469777 |  | |
| Senna rizzinii H.S.Irwin & Barneby | D. de Andrade-Lima 593407 14 Nov 1959 | Brazil. Pernambuco. Camocin de Sao Felix. | 469730 |  | |
| Senna rizzinii H.S.Irwin & Barneby | D. de Andrade-Lima 66-4710 26 Jul 1966 | Brazil. Pernambuco. Panelas, alto da serra, entre Panelas e Cruzes. | 469729 |  | |
| Senna rizzinii H.S.Irwin & Barneby | M. de F. Agra 1949 with E. A. Rocha e E. Locatelli, 16 Apr 1993 | Brazil. Paraíba. Serra de Teixeira, Pido do Jabre. | 469732 |  | |
| Senna rizzinii H.S.Irwin & Barneby | M. de F. Agra 1942 with E. A. Rocha e E. Locatelli, 16 Apr 1993 | Brazil. Paraíba. Serra de Teixeira, Pido do Jabre. | 469733 |  | |
| Senna polyphylla var. neglecta H.S.Irwin & Barneby | N. L. Britton 1034 with W. C. Fishlock, 19 Feb 1913-20 Feb 1913 | Virgin Islands (U.K.). Near settlement, Anagada [Anegada] Island. | 4836 |  | |
| Senna pallida var. tuerckheimiana H.S.Irwin & Barneby | H. von Türckheim 1422 Sep 1888 | Guatemala. Baja Verapaz. Sant Rosa. Alt. 5000 ft. | isotype | 4827 |  |
| Senna pallida var. tuerckheimiana H.S.Irwin & Barneby | H. von Türckheim 1422 Sep 1888 | Guatemala. Baja Verapaz. Sant Rosa. Alt. 5000 ft. | isotype | 4828 |  |
| Senna lourteigiana H.S.Irwin & Barneby | R. A. A. Oldeman B4339 08 Mar 1972 | French Guiana. Layon Belvédère - Région de Saül. | |||
| Senna lourteigiana H.S.Irwin & Barneby | J.-J. de Granville 1637 12 May 1973 | French Guiana. Saint-Laurent-du-Maroni. Sources de la mana, versant N des Monts Galbao, à 10 km WSW de Saül. Alt. 300 m. | holotype | 4872 |  |
| Senna lourteigiana H.S.Irwin & Barneby | J.-J. de Granville 2679 19 Jan 1976 | French Guiana. Saint-Laurent-du-Maroni. Commune de Saül - Région de Saül; Grand circuit ORSTOM Boeuf Mort, pk 6. | |||
| Senna lourteigiana H.S.Irwin & Barneby | M.-F. Prévost 180 Feb 1978 | French Guiana. |