Senna hirsuta(L.) H.S.Irwin & Barneby

woolly senna

WFO wfo-0000163956 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Senna hirsuta, photographed by 葉子
fig. a 葉子, CC0 1.0 / 2022-03-16 / obs. 190612927
Senna hirsuta, photographed by Seema Merchant
fig. b Seema Merchant, CC BY 4.0 / obs. 172648949
Senna hirsuta, photographed by S.MORE
fig. c S.MORE, CC0 1.0 / obs. 174603325
Senna hirsuta, photographed by ritirene
fig. d ritirene, CC BY 4.0 / obs. 169860659
Senna hirsuta, photographed by Haneesh K M
fig. e Haneesh K M, CC0 1.0 / obs. 165321885
Senna hirsuta, photographed by Andrés Ramírez-Barrera
fig. f Andrés Ramírez-Barrera, CC BY 4.0 / obs. 164290735
Senna hirsuta, photographed by Haneesh K M
fig. g Haneesh K M, CC0 1.0 / obs. 162628766
Senna hirsuta, photographed by Haneesh K M
fig. h Haneesh K M, CC0 1.0 / obs. 162629158

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 31 botanical countries

Regions where Senna hirsuta is native: Arizona, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, New Mexico, Argentina Northeast, Argentina Northwest, Belize, Bolivia, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Cayman Is., Colombia, Costa Rica, Cuba, El Salvador, Honduras, Leeward Is., Nicaragua, Panamá, Paraguay, Peru, Puerto Rico, Uruguay, Windward Is. ArizonaMexico CentralMexico GulfMexico NortheastMexico NorthwestMexico SoutheastMexico SouthwestNew MexicoArgentina NortheastArgentina NorthwestBelizeBoliviaBrazil NorthBrazil NortheastBrazil SouthBrazil SoutheastBrazil West-CentralColombiaCosta RicaCubaEl SalvadorHondurasNicaraguaPanamáParaguayPeruPuerto RicoUruguay Cayman Is.Leeward Is.Windward Is.
Native distribution of Senna hirsuta, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Argentina Northeast AGE SOUTHERN AMERICA
Argentina Northwest AGW
Belize BLZ
Bolivia BOL
Brazil North BZN
Brazil Northeast BZE
Brazil South BZS
Brazil Southeast BZL
Brazil West-Central BZC
Cayman Is. CAY
Colombia CLM
Costa Rica COS
Cuba CUB
El Salvador ELS
Honduras HON
Leeward Is. LEE
Nicaragua NIC
Panamá PAN
Paraguay PAR
Peru PER
Puerto Rico PUE
Uruguay URU
Windward Is. WIN
Arizona ARI NORTHERN AMERICA
Mexico Central MXC
Mexico Gulf MXG
Mexico Northeast MXE
Mexico Northwest MXN
Mexico Southeast MXT
Mexico Southwest MXS
New Mexico NWM

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Also published as 18 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Cassia caracasana Jacq.
  • Cassia gooddingii A.Nelson
  • Cassia hirsuta L.
  • Cassia leptocarpa Benth.
  • Cassia leptocarpa var. glaberrima M.E.Jones
  • Cassia leptocarpa var. hirsuta Benth.
  • Cassia longisiliqua Blanco
  • Cassia neglecta var. acuminata Benth.
  • Cassia occidentalis f. ovatolanceolata Chodat & Hassl.
  • Cassia pubescens Jacq.
  • Cassia pubigera Lag.
  • Cassia sulcata Blanco
  • Cassia sulcata sensu Blanco, non DC.
  • Cassia venenifera G.Mey.
  • Cassia venenifera Rodschied
  • Ditremexa glaberrima (M.E.Jones) Britton & Rose
  • Ditremexa hirsuta (L.) Britton & Rose
  • Ditremexa leptocarpa (Benth.) Britton & Rose

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.