Mimosa quadrivalvis var. leptocarpa (DC.) 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
190g. Mimosa quadrivalvis Linnaeus var. leptocarpa (DeCandolle) Barneby, stat. nov. Schrankia leptocarpa DeCandolle, Prodr. 2: 443. 1825. —"in Sancto-Domingo. Poiteau."—Holotypus, perhaps really from French Guiana, G-DC!—Leptoglottis leptocarpa (DeCandoll
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Synonyms
Schrankia leptocarpa DC., Leptoglottis leptocarpa (DC.) Standl., Schrankia trijuga Ram.Goyena, Schrankia argentinensis Burkart
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Description
Variety Description - Stems commonly 4-angulate; leaf-formula ii- iv/12-22(-24) mm; lf-stks 4-16 cm, the petiole at least as long as and usually longer than rachis, the 1-3 interpinnal segments to (0.8-) 1-3.5 cm; rachis of longer pinnae 2—6 cm; lfts near mid-rachis (4-)5.5-13 x (l-)1.2-2.8(-3) mm, dorsally 2-4-nerved from pulvinule, the venulation immersed or almost so; peduncles 4-12(-l 3) mm; capitula without filaments 4-5(-5.5) mm diam.; flowers relatively small, ±1.8-2.3 mm; pods (6—)8—17 cm x 3-4.5 mm, the beak (6-)8-17(-28) mm, the replum 2-3.5(-4) mm and the valves (1-) 1.2-3 mm wide, both armed with perpendicular setaculei (1.5-)2-4 mm, these variably crowded or remote but not basally confluent, the whole fruit either glabrous or minutely granular (but not puberulent) overall.
Distribution and Ecology - In sandy campo, savanna thickets, light woodland, and becoming abundant in disturbed ground, along highways and in abandoned pastures, mostly below 300 but ascending in Bahia and Minas Gerais to 1000 m, widespread over S. America e. of the Andes, from n. Colombia and Venezuela s. to n.-e. Bolivia, Paraguay, n.- e. Argentina, and in Brazil to Sta. Catarina, feebly n. into Panama, (?) Nicaragua, Belize, and s. Mexico (Chiapas, Tabasco), and in the Lesser Antilles to Martinique; described from Hispaniola, but not seen there in modem times.—Fl. indefinitely through the year at equatorial latitudes, in summer s.-ward. Map 26.
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Discussion
A combination of relatively long true petioles, short unarmed peduncles, and small capitula with relatively short filaments (exserted 2.5-3.5, rarely 5 mm) distinguishes var. leptocarpa, the only representative of M. quadrivalvis over most of South America.
The cytology of var. leptocarpa and related forms is in need of systematic study. Frahm-Leliveld (Rev. Cytol. Biol. Veg. 18: 277. 1957) found 2n = 52 in unidentified material of Schrankia leptocarpa, and 2n = 40 is indicated in annotation of a specimen (Baldwin 4520, NY) from Para, Brazil.
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Distribution
Brazil South America| Minas Gerais Brazil South America| Bahia Brazil South America| Santa Catarina Brazil South America| Bolivia South America| Paraguay South America| Colombia South America| Venezuela South America| Panama Central America| Nicaragua Central America| Mexico North America| Chiapas Mexico North America| Tabasco Mexico North America| Martinique South America| Argentina South America|