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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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MACROPTILIUM (Benth.) Urb
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Contributor
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James A. Lackey & W. G. D'Arcy
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PlaceOfPublication
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Symb. Ant. 9: 457. 1928.
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Synonym
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Phaseolus sect. Macroptilium Benth., Comm. Legum. Gen. 76. 1837. TYPE: M. lathyroides (L.) Urban.
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Description
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Vines or sometimes erect or sprawling herbs, sometimes perennial from a thick rootstock. Leaves pinnate trifoliolate or rarely unifoliolate; leaflets glabrous or pubescent but lacking uncinate hairs, stipels ciliate to tomentose; stipules nervate, not prolonged below the insertion. Inflorescences with stiff, elongate
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Habit
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Vines or sometimes erect or sprawling herbs
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Description
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peduncles, the flowers mostly congested at the apex; bracteoles narrow, at least distally, nervate, caducous, rachis with small swellings at the nodes, lacking extrafloral nectaries; pedicels equalling or shorter than the calyx. Flowers pur- plish, red, violet, or white, the interior often vivid; calyx campanulate, the teeth free, the upper 2 teeth sometimes reduced; standard orbicular, emarginate, with 2 small basal auricles, lacking median thickenings; wings longer than the standard and the keel, long stipitate, the keel petals apically spiralled, basally adnate to the staminal tube; style apically recurved and thickened, caducous. Legume lin- ear, turgid or compressed, non septate; seeds numerous, small with a short hilum.
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Distribution
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a genus of about 20 species, all native to the New World tropics, although at least one species is naturalized in the Old World.
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Note
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The plants are sometimes planted for forage, and the seeds are sometimes used for food.
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Key
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a. Stems conspicuously hollow, easily crushed, often 3-7 mm in diameter; standard 12-16 mm long ...... 3. M. lathyroides aa. Stems solid or with a minute, less than 1 mm diameter, lumen, not easily crushed, 1.0-2.5 (4) mm in diameter; standard 8-13 mm long. b. Leaflets linear to lanceolate; pods 3-4 cm long ...... 2. M. gracile bb. Leaflets ovate to broadly lanceolate; pods 4-9 cm long. c. Plants pubescent; leaflets generally hastate or mitten-shaped; stems usually solid ...... 1. M. atropurpureum cc. Plants minutely pubescent to almost glabrous; leaflets generally entire; stems minutely hollow ...... 4. M. longepedunculatum
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