Monographs Details: Senna holwayana var. absoidea 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.
Family:Caesalpiniaceae
Description:Variety Description - Lvs 4-7 cm; petiole 2-3.6 cm, at middle 0.25-0.4 mm diam, terete or almost so, 5-9 times as long as rachis; rachis 3-6 mm; distal pair of lfts broadly obovate 15-36 x 11-24 mm, ±1.3-1.6 times as long as wide; venation as given in key.- Collections: 6.-Fig. 33. [Key: "Lfts exactly 2 pairs in all lvs, separated by a rachis only 3-6 mm; lfts simply penniveined, with 5-6 pairs of major secondary veins; local in s. Guatemala and El Salvador."]

Distribution and Ecology - Dry brushy hillsides, stream-beds, quebradas, 75-600 m, very local in two widely separated localities; valley of rio Motagua in Zacapa and immediately adjoining Chiquimula, Guatemala; and about Lago Olomega in San Miguel, s.-e. El Salvador.-Fl. X-II.

Discussion:A visually striking plant, curiously simulating in habit and foliage Chamaecrista (sect. Absus) zygophylloides var. deamii, but with the axillary two-flowered racemes and beaked anthers of Senna ser. Rostratae. The bicentric dispersal of var. absoidea, especially in relation to the disjunct Salvadorian populations of var. holwayana, is difficult to understand; further collections from El Salvador may, of course, establish a more continuous pattern.
Distribution:Zacapa Guatemala Central America| Chiquimula Guatemala Central America| San Miguel El Salvador Central America|