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(Last Modified On 9/30/2013)
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(Last Modified On 9/30/2013)
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Genus
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MUCUNA Adans.
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Contributor
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W. G. D'Arcy
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PlaceOfPublication
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Fam. P1. 2: 325, 579. 1763.
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Note
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Nomen conserv. TYPE: M. urens (L.) DC. Type conserv.
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Synonym
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Zoophthalmum P. Br., Hist. Jam. 295. 1756. Based on Dolichos urens L. = Mucuna urens (L.) DC. Nomen rejic. Hornera Neck., Elem. Bot. 3: 43. 1790. Citta Loureiro, Fl. Cochinch. 2: 456. 1790. T: C. nigricans Loureiro = Mucuna nigricans (Lour.) Jackson. Negretia Ruiz & Pav6n, Prodr. 98, tab. 21. 1794. LECTOTYPE: N. elliptica R. & P. = Mucuna elliptica (R. & P.) DC. Macroceratides Raddi, Mem. Mat. Fis. Soc. Ital. Sci. 18 (fis.): 392. 1820. TYPE: M. pseudo-stizolobium Raddi.
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Reference
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Burkart, A. 1970. Las Leguminosas-Faseolas Argentinas de los generos Mu- cuna, Dioclea y Camptosema. Darwiniana 16: 175-218.
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Description
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High climbing woody vines. Leaves pinnate trifoliolate, the lateral leaflets oblique; stipels scale-like; stipules often caducous. Inflorescences axillary ra- cemes, the peduncles often elongate and the pedicels subumbellate, at least in bud, bracts often subfoliaceous, enclosing the bud, caducous; pedicels arising in
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Habit
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vines
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Description
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2's and 3's on an expanded portion of the peduncle. Flowers showy, the calyx campanulate, often with irritating hairs, the upper teeth connate, the lower 3 usually unequal; corolla with the standard shorter than the wings, the wings with margins basally ciliate, the keel narrow, apically falcate and indurate; stamens diadelphous, the upper stamen free, the filaments alternately thick and thin, long and short, the anthers sometimes pilose; ovary tomentose, the short stipe sur- rounded by a glandular disc, the style slender, glabrous or pubescent, the stigma capitate, sometimes of a tuft of hairs. Legume oblong, thick or flattened, the margins often winged, undulate between the seeds and somewhat compressed laterally between the seeds, the surface sometimes lamellate with parallel or irregular raised lamellae which may form elongate enations, mostly densely cov- ered with stiff irritating hairs, tardily dehiscent; seeds flat or convex, discoid, the hilum narrow around more than 1/2 the periphery.
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Distribution
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widely distributed in the tropics
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Note
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mostly confined to moist or wet forests. The genus includes perhaps a dozen species.
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Key
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a. Inflorescences short, less than 15 cm long; flowering pedicels less than 10 mm long; flowers more than 5 cm long, the wings more than 15 mm wide at the middle ...... 3. M. rostrata aa. Inflorescences elongate, the peduncle more than 30 cm long; flowering pedicels more than 15 mm long; flowers less than 5 cm long, the wings less than 15 mm wide. b. Leaves copiously pubescent beneath, at least until flowering. c. Flowers less than 4 cm long, the lowest calyx tooth broad, less than 3 mm long; wings less than 8 mm wide; fruit flat, lacking raised lamellae ...... 1. M. holtonii cc. Flowers more than 4 cm long, the lowest calyx tooth narrow, more than 5 mm long; wings more than 10 mm wide; fruit thick, with conspicuous raised transverse lamellae ...... 4. M. sloanei bb. Leaves glabrate beneath. d. Lowest calyx tooth narrow, 7-13 mm long; lateral leaflets mostly 3-veined from the base; fruit mostly 3-7 seeded ...... 5. M. urens dd. Lowest calyx tooth deltoid, 3-5 mm long; lateral leaflets mostly 4-veined from the base; fruit mostly 1-3 seeded ...... 2. M. mutisiana
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