Monographs Details: Senna caudata var. diadena 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 1: 1-454.
Description:Variety Description - Characters as given in key to varieties [Key:"Glands between both pairs of lfts; long interior sepals obovate-suborbicular ±6 mm wide; petals up to 26-30 mm; s. Costa Rica (Pacific slope)."]; pod cylindroid straight ±16-20 x 1.2 cm, the ventral suture ±2.5 mm wide, without thickened margins, the valves becoming leathery atrocastaneous, transversely lenticellate and at length transversely fissured, narrowly 2-winged lengthwise near the middle, the cavity apparently devoid or almost so of foetid pulp, the 2 files of seeds separated by a thick spongy septal wall connecting the 2 sutures; seeds symmetrically oblong- ellipsoid, little compressed, 5.5-6 x 2.5-2.7 mm, the testa smooth fuscous, scarcely lustrous, exareolate.—Collections: 4.

Distribution and Ecology - Humid forest near 1000-1200 m, local, known only from the Pacific slope of Cordillera de Talamanca, in the basin of rio Grande de Terreba, in San Jose and Puntarenas, Costa Rica.—Fl. VIII-XI.

Distribution:San José Costa Rica Central America| Puntarenas Costa Rica Central America|