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Project Name Data (Last Modified On 10/1/2013)

Flora Data (Last Modified On 10/1/2013)
Genus VIGNA Savi
Contributor James A. Lackey & W. G. D'Arcy
PlaceOfPublication Nuovo Giorn. Lett. 8: 113. 1824.
Note Based on Dolichos luteolus Jacq. = Vigna luteola (Jacq.) Benth.
Description Vines or herbs, rarely shrubby, mostly with sturdy rootstocks, lacking unci- nate hairs. Leaves pinnate or subdigitate trifoliolate, rarely 1-foliate, mostly en- tire; stipels, nervate, mostly blunt; glabrate stipules sometimes produced below the insertion, sometimes bilobate. Inflorescences axillary or terminal, pseudor- acemes or subcapitate, the rachis contracted, the nodes glandular; bracts and bracteoles caducous; pedicels 1-2 per node, mostly shorter than the calyx. Flow- ers yellowish or white, sometimes with some purple or violet; calyx 2 lipped, the upper lip emarginate, the lowest tooth of the lower lip longest; standard orbicular, auriculate, sometimes appendaged on the dorsal face, the wings about equalling the standard and keel, the keel apically curved up to 1 spiral, often oblique; vexillary stamen free, the anthers uniform; style apically thickened and barbate on the inner face, caducous, sometimes with a curved beak. Legume linear to oblong, turgid or compressed, straight or curved, not septate; seeds reniform or quadrate, the hilum short or long, a well developed aril sometimes present. Vigna embraces about 150 species of tropical regions of both hemispheres. In Panama most species have flowers at least partly yellow, but in other countries some species have violet or purple flowers. A number of species of Vigna are important food plants for man, e.g. V. unguiculata, and species are sometimes cultivated for cattle fodder.
Habit Vines or herbs
Note Vigna radiata (L.) R. Wilczek was reported (as V. aureus Roxb.) by Standley (1928), but no specimens have been seen of this species from Panama. The species is commonly used in Panamanian restaurants for bean sprouts (English) or frijoles nacidos (Spanish), but inquiries amongst Chinese merchants indicate that all such beans are imported and none are grown in Panama. It is likely however, that the species has been cultivated or has grown to maturity from refuse from time to time. Vigna radiata is an erect herb which has distinctive, large, 5-15 mm long stipules.
Key a. Style coiled 3-5 revolutions. b. Leaflets linear to narrowly lanceolate ...... 5. V. linearis bb. Leaflets broadly lanceolate to ovate. c. Seeds 8-15; pedicels of mature flowers and fruits 2-6 mm long; calyx teeth lanceolate ...... 1. V. adenantha cc. Seeds 17 or more; pedicels of mature flowers and fruits 6-13 mm long; calyx teeth broad ...... 2. V. caracalla aa. Style erect or sigmoid. d. Inflorescences pseudoracemose. e. Leaflets lobed ...... 4. V. lasiocarpa ee. Leaflets not lobed. f. Seeds 7-8; stipules with small lobes below the point of attachment; bracteoles about twice the calyx length ...... 3. V. juruana ff. Seeds 9-13; stipules not produced below the point of attachment; bracteoles about half the calyx length ...... 8. V. peduncularis dd. Inflorescence subumbellate. g. Seeds 6-9; flowers 10-19 mm long. h. Upper calyx lobe partially united ...... 6. V. longifolia hh. Upper calyx lobe completely united. i. Leaflets obovate, apically blunt rounded, or emarginate fleshy ...... 9. V. retusa ii. Leaflets ovate, apically pointed, not fleshy ...... 7. V. luteola gg. Seeds 12-20 or more; flowers (15) 20-27 mm long. j. Plants with long spreading hairs; pods ca. 4 mm wide ...... 11. V. vexillata jj. Plants glabrate; pods ca. 8 mm wide ...... 10. V. unguiculata
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