Monographs Details: Senna organensis var. friburgensis 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.
Family:Caesalpiniaceae
Description:Variety Description - Petioles stout 0.6-2.5 cm; glands between all pairs of lfts; stipules oblanceolate 10-15 x 2-7 mm; lfts 4-5 pairs accrescent upward, coriaceous, ventrally glossy, pallid dorsally, reticulate on both faces, the basally semicordate plane-margined blades up to 26-50 x 13-22 mm; fl and strigulose ovary of var. heterandra, but the centric abaxial (antesepalous) stamen much smaller than its 2 neighbors, sterile.—Collections: 2.

Distribution and Ecology - Cliffs of the Organ Mountains, probably on the higher treeless morros, known only from Novo Friburgo and Teresopolis, Rio de Janeiro.—Fl. II-IV.

Discussion:This remarkable plant seems clearly related to S. organensis sens. lat. but differs in the heteromorphic stamens and strongly graduated plane-margined leaflets at once coriaceous in texture and reticulate on both faces. The constancy and significance of the differential characters listed in our key to varieties need confirmation from new collections, and the status of the variety is contingent on the morphology of the as yet unknown pod and seeds.
Distribution:Rio de Janeiro Brazil South America|