Mimosa pellita var. dehiscens

Title

Mimosa pellita var. dehiscens

Authors

Rupert C. Barneby

Scientific Name

Mimosa pellita var. dehiscens Barneby

Description

266b. Mimosa pellita Humboldt & Bonpland ex Willdenow var. dehiscens Barneby, var. nov., a var. pellita, caeterius haud diversa, leguminis septis interseminalibus tenuissime membranaceis vel obsoletis articulo quoque utrinque dehiscenti et semen suum ante valvulas delapsas liberanti diversa.—Brazil. Distrito Federal: Brasília, 975 m, 7.IV.1966 (fr), Irwin (with Grear, Souza & Reis dos Santos) 15310.— Holotypus, UB; isotypus, NY.

Essentially like var. pellita except in dehiscence of pod, but less variable in pubescence, the cauline setae almost always appressed, the armament usually sparse, the prickles on interpinnal segments of lf-stk often few or 0; body of pod 40-75 x 8-12 mm, 12-21-seeded, the papery brown, reddish or livid valves pilose with slender ascending or forwardly subappressed tawny setae to 2.5-4 mm, the interseminal septa 0 or tenuously membranous, ruptured by the swelling seed and dehiscent at each end, the seed itself free- falling naked.

In moist campo and also in seasonally dry campo cerrado, ±200-1000 m, scattered around the s. edge of the Amazonian Hylaea in Brazil, Bolivia, and Paraguay, from the headwaters of rio Juruá in Acre s.-e. through the Beni-Mamoré basin in Bolivia to the middle Paraguai valley, e. through Mato Grosso and s. Goiás to n.-centr. Bahia and centr. Minas Gerais.—Fl. throughout the year unless drought-inhibited. Map 36.