Senna roemeriana (Two-leaved Senna)

Plate 1 figs. a–h

Senna roemeriana, photographed by Michelle W. （鍾偉瑋） — fig. a Michelle W. （鍾偉瑋）, CC BY 4.0 / 2022-06-06 / obs. 204316559

Senna roemeriana, photographed by Bonnie Semmling — fig. b Bonnie Semmling, CC BY 4.0 / obs. 202952798

Senna roemeriana, photographed by saltyhiker — fig. c saltyhiker, CC BY 4.0 / obs. 197786717

Senna roemeriana, photographed by CK2AZ — fig. d CK2AZ, CC BY 4.0 / obs. 202151324

Senna roemeriana, photographed by Annika Lindqvist — fig. e Annika Lindqvist, CC BY 4.0 / obs. 197611182

Senna roemeriana, photographed by Reid Hardin — fig. g Reid Hardin, CC BY 4.0 / obs. 196072550

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.

Flowering n = 461 observations

147

103

Flowering observations of Senna roemeriana by month
Month	Observations
Jan	0
Feb	0
Mar	9
Apr	147
May	103
Jun	43
Jul	36
Aug	39
Sep	60
Oct	20
Nov	4
Dec	0

Peak flowering in Apr, from 461 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 3 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 roemeriana Scheele
Earleocassia roemeriana (Scheele) Britton
Earleocassia roemeriana (Scheele) Britton & Rose

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.

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