Monographs Details: Senna racemosa var. coalcomanica H.S.Irwin & Barneby
Authors:Howard S. Irwin, Rupert C. Barneby
Authority: Irwin, Howard S. & Barneby, Rupert C. 1982. The American Cassiinae. A synoptical revision of Leguminosae tribe Cassieae subtrib Cassiinae in the New World. Mem. New York Bot. Gard. 35, part 2: 455-918.
Description:Variety Description - Foliage strigulose with straight subappressed hairs up to 0.4-0.6 mm, the vesture of inflorescence a little looser and rusty; lvs 16-20 cm; lfts 8-9 pairs, up to 2.8-4.8 x 1.2-2 cm, obovate or elliptic-obovate obtuse mucronulate, the 6-8 pairs of secondary veins and sometimes the tertiary venulation of mature blades finely prominulous above; outer sepals 3.5-4.5 mm, the inner ones only thinly pubescent dorsally 6-7 mm; 4 petals 13.5-15 mm, the odd one 15-17 mm; anthers thinly pilosulous toward apex with weak hairs up to ±0.4 mm; ovary glabrous; style ±3 mm; pod unknown.-Collections: 3. [Key: "Ovary and pod glabrous; mature lfts reticulately venulose on upper face; e. Mexico (s.-e. San Luis Potosi to Yucatan Peninsula), n.-e. Guatemala (Peten) and far w. Cuba; local in s.-w. Mexico (w. Michoacan and adjoining Colima). Lfts of larger lvs 8-10 pairs; pod (unknown in s.-w. Mexican var. coalcomanica) 11-19.5 cm, the seed-locules 6-10 mm long; distantly allopatric. Lfts subappressed-strigulose; local near 140-500 m in w. Michoacan and adjoining Colima."]

Distribution and Ecology - Rocky hillsides and stream banks, in drought-deciduous brush-woodland, 140-500 m, local, known only from the Pacific foothills in Colima (mun. Coquimuatlan) and s.-w. Michoacan (mun. Aquila) in s.-w. Mexico.-Fl. X-I.

Discussion:For differential commentary see under the preceding and following.
Distribution:Colima Mexico North America| Michoacán Mexico North America|