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(Last Modified On 10/1/2013)
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(Last Modified On 10/1/2013)
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Species
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Vigna linearis (H.B.K.) Marechal
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PlaceOfPublication
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Taxon 27: 202. 1978.
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Synonym
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Phaseolus linearis H.B.K., Nov. Gen. Sp. P1. 6: 443. 1823. TYPE: Phaseolus elongata Rose, Contr. U.S. Natl. Herb. 8: 311. 1905. SYNTYPES: Mexico, Nelson 2692, 2848 (?US, neither seen).
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Description
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Ascending or scandent perennial herb or vine; stems wiry, retrorsely tawny strigose, glabrescent, often reclining; roots fleshy. Leaves pinnate trifoliolate; leaflets linear oblong, mostly 3-5 cm long, 4-7 mm wide, but sometimes wider and slightly 3-lobate, apically obtuse, rounded or minutely retuse, basally trun- cate, coriaceous, minutely ciliolate on the margins and the lower costa, sometimes with a few coarse hairs at the very base, otherwise glabrous, the costa prominent, elevated beneath, the minor venation prominent arising at right angles to the costa, the major lateral veins anastomosing to form a crenate submarginal vein; petiolules ca. 1 mm long, tawny strigose; petioles slender, glabrate, the rachis short, to 5 mm long; stipels ovate, striate, glabrate, 1-2 mm long; stipules ovate lanceolate, striate, tawny ciliate, ca. 4 mm long. Inflorescences few flowered; peduncle slender, 10-15 cm long, glabrate or pubescent with short, appressed tawny hairs; nodes enlarged, mostly near the apex; bracteoles linear lanceolate, glabrate, striate, slightly shorter than the calyx; bracts ovate, striate, glabrous, about as long as the bracteoles; pedicels ca. 2 mm long. Flowers red purple; calyx open campanulate, the tube 3-4 mm long, glabrate, the upper teeth deltoid, short, the lower 3 teeth linear, longer than the tube, pubescent; standard 2.5 cm long, the keel forming a spiral (Standley & Steyermark). Legume linear, flat, 6- 9 cm long, 5 mm wide, glabrous.
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Habit
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herb or vine
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Note
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This species is quite similar to Macroptilium gracile but differs in the lower calyx teeth being narrow, puberulent and longer than the tube, and in having wider and mucronulate rather than pointed leaves.
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Distribution
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ranges from Mexico through Central America and South Amer- ica to Paraguay.
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Note
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It grows mainly in open rocky or savannah areas. In Panama it has been collected only in savannah area of pronounced dry season.
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Specimen
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COCLE: Penonome, 50-1000 ft, Williams 603 (NY). PANAMA: Cerro Campana, 2000 ft, Clewell 3021 (SCZ). Burned over area SW of Chepo, D'Arcy 5185 (MO, SCZ). Taboga Island, Miller 2040 (US). Between Matias Hernandez and Juan Diaz, Standley 32065 (US).
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