FABACEAE. 195 



1. Dolichos Lablab L. Sp. PL 725. 1753. 



Sparingly pubescent, climbing or trailing, 5 m. long or less. Leaves long- 

 petioled. Leaflets ovate, acute or acuminate, 4-10 cm. long, the terminal one 

 equilateral and long-stalked, the others inequilateral and short-stalked; racemes 

 axillary, several-flowered, longer than the leaves; flowers short-pedicelled, 1.5- 



2 cm. broad, white to purple; pods about 7.5 cm. long, nearly 2.5 cm. wide, the 

 upper edge nearly straight, the lower curved and glandular-serrulate; seeds 

 somewhat compressed, black with a white linear strophiole, about 1 cm. long. 



Spontaneous after cultivation. New .Providence and Eleuthera. Native of the 

 Old World tropics. Widely planted and spontaneous in tropical America. BLACK 

 BEAN. 



2. Dolichos insularis Britton sp. nov. 



Nearly glabrous, climbing or trailing, up to 7 m. long or longer. Leaflets 

 ovate, thin, 4-7 cm. long, acute, obtuse or acuminate, sparingly pubescent near 

 the base beneath, the terminal one equilateral, rather long-stalked, the lateral 

 ones inequilateral, short-stalked; racemes axillary, thyrsoid, many-flowered, 

 stout-peduncled, longer than the leaves; pedicels pubescent, 4-6 mm. long; 

 bractlets obtuse, 2 mm. long; calyx unequally 5-lobed, about 7 mm. long, the 

 lobes rounded; corolla purplish; standard wider than long, about 1 cm. long, 

 nearly sessile, emarginate; wings ovate, obtuse, stalked, about 11 mm. long, keel 

 obliquely curved, stalked, acuminate, about 9 mm. long; ovary puberulent; style 

 penicillate; pods elliptic-obovate, 2-3-seeded, compressed, 5-7 cm. long, about 



3 cm. wide, rather stout-beaked, the valves yellowish puberulent, entire-margined ; 

 seed globular, about 1 cm. in diameter, black, with a white linear strophiole. 



Old field, Great Cistern, Abaco: Cuba; Mexico. Type from Cayo Ballenato 

 Grande, Cuba (Shafer 1026). ISLAND BEAN. 



24. VIGNA Savi, Mem. Phas. 3: 7. 1826. 



Herbaceous vines, or sometimes erect herbs, with pinnately 3-foliolate 

 stipulate leaves, the leaflets broad. Flowers clustered at the ends of long 

 axillary peduncles, yellowish or purplish, the rachis of the head or raceme 

 knotty, the bracts and bractlets early deciduous. Calyx 5-toothed, or the 2 

 upper teeth united. Standard nearly orbicular, auricled at the base; wings 

 shorter than the standard; keel about equalling the standard, slightly incurved. 

 Stamens diadelphous (9 and 1). Ovary sessile; ovules numerous; style bearded 

 along the inner side; stigma oblique. Pod linear, nearly terete, 2-valved. [In 

 honor of Domenico Vigna, a commentator on Theophrastus.] About 30 species, 

 natives of warm and tropical regions. Type species: Dolichos luteolus Jacq. 



1. Vigna repens (L.) Kuntze, Eev. Gen. PI. 212. 1891. 



Dolichos repens L. Syst. ed. 10: 1163. 1759. 



Dolichos luteolus Jacq. Hort. Vind. 1 : 39. 1770. 



Vigna luteola Benth. in Mart. Fl. Bras. t 15i : 194. 1859. 



Foliage usually pubescent with appressed hairs. Stems trailing or climb- 

 ing, branching, when pubescent the hairs reflexed ; leaflets 3, ovate to lanceolate 

 or linear, 2-8 cm. long, acute, more or less distinctly reticulated, short-stalked; 

 petioles usually longer than the leaflets; peduncles surpassing the leaves, 

 retrorsely pubescent at the top; pedicels 1-3 mm. long, corymbose; calyx cam- 

 panulate, oblique, its lobes triangular to lanceolate; corolla yellowish brown; 

 standard nearly reniform, notched, less than 2 cm. long; pods linear, 4-5 mm. 

 long, nearly terete, pubescent. 



Moist roadsides. Abaco and Andros : Bermuda ; Florida to Texas ; Mexico to 

 Panama and throughout South America to Argentina ; West Indies ; Old World 

 tropics. YELLOW VIGNA. 



