Monographs Details: Senna macranthera var. andina 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 - Fruticose, flowering at 0.5-3 m; petiole proper 8-15, rachis 2-8 mm, both very slender; distal lfts of larger lvs obovate 1.8-3.6 x 1-1.8 cm, the proximal smaller pair inserted above middle of lf-stalk; pedicels 2.5-3.5 cm; long inner sepals submembranous 7-10 x 5-8 mm; style 2-3.5 mm; ovules 90-104; pod 6-8 cm.— Collections: 5. [Key: "Plants of Venezuela, Colombia s. Ecuador and n. (Andean) Peru. Lfts variable in size but pod always short (5-11 cm), 76-104-ovulate. Calyx relatively ample, the largest inner sepal 7-14 x 4.5-8 mm; shrubs 1.5-3 m. Ovules 92-144. Lfts densely softly pilosulous with spreading-incumbent hairs, either on both faces or beneath only. Stature and lfts diverse. Distal lfts of larger lvs 2-6(-7) cm; shrubs to ±3(-4) m; pod 7-10 cm, 112-140-ovulate. Distal lfts of larger lvs 2-6(-6.5) x 0.8-2.5 cm, pilosulous beneath; pod 7-10 cm. Larger distal lfts smaller, 2-5.5 x 1-2.6 cm; style 2-3.5 mm; Venezuela, Peru. Rachis between pairs of lfts 1.5-8(- 12) mm, much shorter than true petiole, the proximal pair thus well above middle of lf-stalk; Peru (Cajamarca) and Ecuador (Loja)."]

Distribution and Ecology - Dry rocky slopes, hedgerows and along drainage runoff channels, 930-1600 m, local, known only from the valleys of rio Huancabamba between Choloque and Pucara in prov. Jaen (and presumably adjoining Cutervo), dept. Cajamarca, of rio Maranon in extreme s. prov. Chachapoyas, dept. Amazonas and n. prov. Bolivar, dept. La Libertad, Peru, and from near Vilcabamba in Loja, Ecuador.— Fl. I, IV-VI, X, perhaps intermittently through the year.

Discussion:For commentary on this greatly isolated race of S. macranthera see under the preceding.
Distribution:Cajamarca Peru South America| Amazonas Peru South America| La Libertad Peru South America| Loja Ecuador South America|