Senna coimbrae M. Nee & Barneby is described and illustrated from plan
ts indigenous in the Jardin Botinico de Santa Cruz, Bolivia. In the co
ntext of ser. Bacillares, of which it has the general aspect and morph
ology, the syndrome of two nectaries on each leafstalk, almost homomor
phic fertile stamens, and short, relatively few-seeded pod is distinct
ive.