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12. Vigna unguiculata (Linnaeus) Walpers, Repert. Bot. Syst. 1: 779. 1842.
豇豆 jiang dou
Annual or perennial herbs, erect, trailing, or twining. Stems 1-3 m, subglabrous. Stipules lanceolate, ca. 1 cm, with a narrow spur below point of attachment; leaflets ovate-rhomboid, 5-15 × 4-6 cm, lateral ones oblique, puberulent or glabrous on both surfaces, base acute to rounded, apex acute. Racemes axillary, with 2-6 flowers clustered at top of rachis. Calyx campanulate, 6-10 mm; teeth lanceolate. Standard yellowish white or violet, suborbicular, 1.2-3.3 × 1-3.2 cm, apex emarginate; wings blue to purple, subdeltoid; keel usually white or pale, not twisted. Legumes terete, 7.5-30(-90) × 0.6-1 cm. Seeds several, dark red or black, mottled with black or brown, oblong or reniform, 6-12 mm.
Widely cultivated in China [native to Africa and Asia; widely cultivated in tropical and subtropical regions].
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| 1 |
Herbs twining, 2-4 m; legumes 30-80(-90) cm, pendulous, slightly fleshy and inflated when young; seeds 8-12 mm. |
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12b subsp. sesquipedalis |
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Herbs erect or trailing, 15-80 cm; legumes 7.5-30 cm, more solid and not inflated when young; seeds 6-9 mm |
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(2) |
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| 2 (1) |
Legumes 20-30 cm, pendulous. |
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12a subsp. unguiculata |
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Legumes 7.5-13 cm, erect or spreading. |
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12c subsp. cylindrica |
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Lower Taxa
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