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Project Name Data (Last Modified On 9/30/2013)
 

Flora Data (Last Modified On 9/30/2013)
Genus PHASEOLUS L.
Contributor James A. Lackey & W. G. D'Arcy
PlaceOfPublication Sp. P1. 723. 1753
Note TYPE: P. vulgaris L.
Description Vines, herbs or subshrubs. Leaves pinnate trifoliolate, the leaflets mostly entire, pubescent or glabrate but minute, uncinate hairs present, the stipels often oblong, thin, glabrous; stipules acute, nervate, often pubescent, not prolonged below the insertion. Inflorescences axillary, the flowers congested in fascicles along the rachis, the nodes not swollen, not glandular, the rachis eglandular; bracteoles ovate or greatly reduced and much shorter than the calyx, nervate, puberulent, persistent at least until anthesis; bracts ovate or lanceolate, nervate, puberulent; pedicels mostly longer than the calyx. Flowers blue, purple, violet, yellow or white; calyx mostly 2-lipped, the upper teeth partly united; standard symmetrical, orbicular, basally appendaged, the wings partly spiralled, apically cucullate, the keel in 2-3 spirals; vexillary stamen free, the free part of the others elongate, the anthers nearly uniform; ovary 1-many ovulate, the style apically thickened, curved in 1.5-2.5 spirals, hairy inside, distally caducous. Legume linear or oblong, straight or slightly curved, not septate, compressed or turgid, sometimes beaked; seeds 1-many, oblong to reniform, the hilum short and cen- tral.
Habit Vines, herbs or subshrubs
Note Phaseolus includes about 50 species, all of the New World, although under older circumscriptions, the genus may embrace 100-300 species. In Panama, Phaseolus is a genus of both uplands and of low elevations. Various members of the genus are widely cultivated for food in both temperate and tropical countries.
Key a. Bracts conspicuous, foliaceous, more than 5 mm long; inflorescences dense, many flow- ered; pods pubescent. b. Bracteoles longer than the calyx; flowers bright red (white), 16-25 mm long; lowest calyx tooth conspicuously more tomentose than the others; pod more than 6 cm long; stipels more than 4 mm long; cultivated species ...... 1. P. coccineus bb. Bracteoles minute, shorter than the calyx; flowers red to purple (white), 11-15 mm long; lowest calyx tooth only slightly pubescent, hardly more so than the others; pod less than 6 cm long; stipels less than 4 mm long; native species ...... 3. P. tuerckheimii aa. Bracts inconspicuous, minute, less than 5 mm long; inflorescences open, few flowered; pods mostly glabrate. c. Pod straight, narrow, mostly 5-10 seeded; peduncle less than 1 cm long; flowers more than 10 mm long, the standard glabrate outside with a few hairs on the midvein; stipels more than 1.5 mm long ...... 4. P. vulgaris cc. Pod curved, broad, mostly 2-4 seeded; peduncle more than 2 cm long; flowers less than 10 mm long, the standard scattered pubescent outside; stipels less than 1.5 mm long ...... 2. P. lunatus
 
 
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