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(Last Modified On 9/30/2013)
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(Last Modified On 9/30/2013)
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Species
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Macroptilium gracile (Benth.) Urban
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PlaceOfPublication
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Symb. Ant. 9: 457. 1928.
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Synonym
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Phaseolus gracilis Poepp. ex Benth., Ann. Wiener Mus. Naturgesch. 2: 77. 141. 1838. TYPE: Cuba, Poeppig, not seen.
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Description
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Perennial herb or vine, erect or sprawling; stems slender, wiry, with minute, white retrorse hairs on emerging, soon glabrous, terete; rootstock woody, en- larged. Leaves pinnate trifoliolate; leaflets linear, mostly 3-7 cm long, 2-5 mm wide, apically pointed or blunt, mucronulate, basally narrowed, truncate, rarely ovate and 7-8 mm wide, glabrous or sometimes scabrous above; petiolules in- conspicuous, ca. 1 mm long, yellowish, strigose; petioles slender, about as long as the terminal leaflet, strongly angled, minutely puberulent; stipels 0.5-1.0 mm long, scale-like; stipules subulate, pubescent, ca. 1 mm long. Inflorescences ter- minal, 20-25 cm long; peduncle slender, the nodes swollen, glandular; bracteoles and bracts subulate, ca. 1.5 mm long, ciliate; pedicels 1 mm long, ca. 2 mm long in fruit, disposed along the apex of the peduncle. Flowers red, purple or pink; calyx tubular, ca. 4 mm long, the teeth subequal, deltoid to subulate, much shorter than the tube, evenly minutely puberulent; standard 1.5 cm long, the keel spi- ralled. Legume linear, 3-5 cm long, ca. 2 mm wide; seeds (Standley & Steyer- mark) 2 mm long, shiny.
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Habit
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herb or vine
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Note
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This species resembles Vigna linearis, but the leaves are often scabrous and are more pubescent. Only the major lateral veins of the leaves are prominently at right angles to the costa whereas in V. linearis, much of the minor venation parallels the major lateral veins. The calyces are quite different in the two species.
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Distribution
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wide ranging in Central and South America and in the Antilles
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Note
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occurring in grassy savannahs with seasonal drought. In Panama it has been collected in the Pacific lowlands.
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Specimen
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COCLE: Penonome, Williams 131 (NY, US). PANAMA: Pacora, 35 m, Allen 815 (MO, NY), 996 (MO). Llanos of lower Rio Cabra, Maurice 791 (US). Panama Golf Course, Piper 5146 (US). Sabana de Juan Corso near Chepo, 60-80 m, Pittier 4745 (US). Between Rio Pacora and Chepo, Porter et al. 5137 (MO).
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