Mimosa radula var. radulina Barneby
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Authors
Rupert C. Barneby
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Authority
Barneby, Rupert C. 1991. Sensitivae Censitae. A description of the genus Mimosa Linnaeus (Mimosaceae) in the New World. Mem. New York Bot. Gard. 65: 1-835.
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Family
Mimosaceae
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Scientific Name
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Type
403d. Mimosa radula Bentham var. radulina Barneby, var. nov., inter var. imbricatam ac var. radulam quasi interludens, a priori foliolis paucijugis amplis foliisque nonnullis inferioribus breviter sed manifeste petiolatis, ab altera, quoad foliolorum ambi
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Description
Variety Description - Like var. imbricata in habit, markedly different in leaf-formula, the virgate stems 1.5-2 m, near base 4-7 mm diam., shaggy-pilose with spreading, sordid or lutescent hairs to 2-4 mm and clothed from base upward into the inflorescence with sessile and some proximal short-petiolate lvs inserted at intervals of 1-4 cm, the longest petiole not over 3 cm, the ample lfts pilose on both faces; rachis of pinnae (1-)1.5-7 cm, the interfoliolar segments mostly 5-15 mm; lfts 4-6-jug., broadly semi-ovate-cordate, those of lvs at and below mid-stem 15-55 x 9-25 mm, 1.8-2.3 times as long as wide, the slender continuous margin with fine ascending setae to 1-2.5 mm, dorsally 3-5-nerved from pulvinule; peduncles 12-35 mm; capitula without filaments 8-10 mm diam., prior to anthesis submoriform; bracts 3-4 x 0.4-0.5 mm; calyx 1.8-3 mm; corolla 3-4.4 mm.
Distribution and Ecology - On rocky hillsides and creek-banks in cerrado climax, 950-1000 m, local in Distrito Federal, Brazil (Cidade Eclética; sources of rio Ponte Alta) and in the foothills of Sa. dos Pirineus in s.-centr. Goiás.-Fl. I-II(-?).
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Discussion
The var. radulina resembles var. radula in low number and ample size of leaflets, which distinguish it sharply from var. imbricata and var. semitonsa. It differs from var. radula in soft pilose cauline indumentum of almost smooth setae, and in materially shorter pinna-rachises. The combination of short pinnae and few large leaflets is diagnostic within the species.
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Distribution
Brazil South America| Distrito Federal Brazil South America| Goiás Brazil South America|