Senna macranthera var. andina

Title

Senna macranthera var. andina

Authors

Howard S. Irwin, Rupert C. Barneby

Scientific Name

Senna macranthera var. andina H.S.Irwin & Barneby

Description

42h. Senna macranthera (Colladon) var. andina Irwin & Barneby, var. nov., a var. pudibunda, remote in Brasilia orientali allopatrica, praesertim pedicellis elongatis 25-36 (nec 15-25) mm longis parum absimilis, a var. quadrifoliolata vix nisi foliolorum paribus approximatis (inferior-ibus supra nec versus medium petiolum insertis) dispar.—PERU. Ca- jamarca, prov. Jaen: Pucara, across Rio Huancabamba opposite town, alt. 930 m, 18.1.1964 (fl, fr jun), P. C. Hutchinson & J. K. Wright 3602.—Holotypus, NY; isotypi, F, K, US.

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.

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.

For commentary on this greatly isolated race of S. macranthera see under the preceding.