Mimosa ramosissima Benth.
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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
358. Mimosa ramosissima Bentham, Trans. Linn. Soc. London 30: 394. 1875 & in Martius, Fl. bras. 15(2): 312. 1876.-"Habitat ad Caldas provinciae Minas Geraës: Regnell III. n. 497."—Holotypus, dated 2. VI. 1865 (fl, frjun), K! = NY Neg. 1781; isotypi, C! =
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Synonyms
Mimosa ramosissima var. ramosissima
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Description
Species Description - Diffusely ascending or weakly sarmentose, prickly microphyllous shrubs attaining (l-)2-5 (-6) m, freely branching distally, the homotinous stems, lf-stks and peduncles at once gray-puberulent and hispid(ulous) with erect rufescent setae (0.5-)0.7-2 mm, the stems in addition armed with recurved brownish broad-based aculei to 1-2 mm, the small neat brown-olivaceous lvs subconcolorous, the lfts glabrous on both faces or often minutely puberulent beneath, finely discontinuously appressed-ciliolate, the solitary or at times geminate peduncles axillary to all or most lvs along the terminal branchlets, forming wide pyramidal leafy panicles of small globose capitula. Stipules narrowly lance-attenuate 2-5.5 x 0.2-0.5 mm, 1-nerved, dorsally puberulent, distantly pectinate-ciliate, persistent. Leaf-stalks including pulvinus 1—2.5(—3.5) x 0.25-0.4 mm, obscurely sulcate; pinnae 1-jug., the rachis of each 5—15(—16) mm, the interfoliolar segments 0.3-1 (— 1.2) mm, inconspicuously ridged and excavate ventrally; lfts (12-)13-20(-21)-jug., decrescent proximally and also upward from near mid-rachis, the first pair 0.1-0.3 mm distant from subulate paraphyllidia 0.3-0.5 mm, the blades narrowly oblong from semicordate base, at apex deltately acute apiculate, the longer ones 2.2-4.5 x 0.6-1.1 mm, 3-4.5 times as long as wide, all weakly 2-nerved from pulvinule, the midrib slightly displaced proximally but subcentric distally, prominulous and pallid only dorsally, either from pulvinule upward or only beyond midblade. Peduncles ascending or widely refracted (3—)5—17 mm; capitula without filaments 4-5 mm diam., prior to anthesis moriform, the obtuse fl-buds densely gray-puberulent; bracts narrowly ovate 0.3-0.8 mm, puberulent dorsally but not setose-ciliate, persistent; flowers 4-merous 4-androus, all but a few proximal ones bisexual; calyx narrowly campanulate firm-textured 0.8-1.2 mm, the prominently 4-ribbed brownish tube glabrous, the broadly triangular or depressed-deltate lobes 0.1-0.3 mm, incurved into the corresponding depression between segments of corolla, dorsally puberulent; corolla 1.6-2.2 mm, the ovate concave 1-nerved, scarcely thickened lobes 0.5-0.75 x 0.3-0.5 m; filaments pink, free to base, exserted 3.2-4.7 mm. Pods (few seen) numerous in hemispherical clusters, sessile, in profile narrowly oblong ±9-13 x 3 mm (2-)4(-5)- seeded, the replum and valves alike puberulent and hispid with divaricate straight compressed tapering yellowish setae, those of replum pluri-seriate and to 3-4 mm, those of valves scarcely shorter, the valves when ripe breaking up into free-falling, individually dehiscent articles about as wide as long.
Distribution and Ecology - In moist or wet soils at gallery margins and in campo, recorded at elevations between 800 and 1600 m, discontinuously dispersed along Sa. do Mar from near 28°S in Sta. Catarina n. through e. Paraná to w. end of Sa. da Mantiqueira in the e. lobe of S. Paulo and adj. s.-w. Minas Gerais, Brazil.-Fl. (VI-)VII-XII(-?).
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Discussion
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Distribution
Brazil South America| Santa Catarina Brazil South America| Minas Gerais Brazil South America| São Paulo Brazil South America| Paraná Brazil South America|