Senna organensis var. friburgensis

Title

Senna organensis var. friburgensis

Authors

Howard S. Irwin, Rupert C. Barneby

Scientific Name

Senna organensis var. friburgensis H.S.Irwin & Barneby

Description

104d. Senna organensis (Harms) var. friburgensis Irwin & Barneby, var. nov., a var. heterandra, quacum filamentis abaxialibus antepetalis elongatis (±5.5 mm longis) congruit, glandulis inter omnia nisi ultimum foliolo- rum paria, foliolis coriaceis latis (ultimo cujusque folii 13-22 nec 10-13 mm lato) necnon stamine abaxiali centrico sterili certe diversa, a sympatrica var. organensi androecii forma et magnitudine, foliolo- rum textura stipulisque oblanceolatis 2-7 mm latis distantior.—BRAZIL. Rio de Janeiro: Felsen der Pedra do Conico bei Neufreiburg [=Novo Friburgo], 14.IV. 1895 (fl), E. Ule 3670, HBG = NY Neg. 9687.

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.

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

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.