Phaseolus. LEGUMINOS^. 159 



Tribe II. PHASEOLEjE. Broicn; Benth. 



Corolla papilionaceous. Stamens mostly diadelphous (9^1). Legume continuous, dehis- 

 cent, never separating into joints, hut often torose, and with cellular partitions between 

 the seeds. Cotyledons thick : radicle incurved. — Mostly twining, herbaceous or shrubby 

 plants. Leaves usually pinnately trifoliolate {rarely reduced to a single leaflet), some- 

 times unequally pinnate, stipellate. Inflorescence axillary. 



CONSPECTUS OF THE SUBTRIBES AND GENERA. 



Subtribe 1. EoPHASEOLEa:. Ovary with several ovules. Inflorescence racemose. Style often indurated above 

 the middle. Cotyledons thick, nearly unaltered in germination. 



♦ Leaves pinnalehj Irijoliolalc. 



4. Phaseolus. Keel, with the stamens and style, spirally twisted or circinate. 



•* Leaves uneqtmllij pinnate. 



5. Apios. Keel, with the stamens and style, at length spirally twisted. Legume nearly terete. Root tuberous. Leaves 



5 - 7-folioIate. 



Subtribe 2. GLYCiNEiE. Ovary with several ovules. Inflorescence racemose. Style not indurated. Cotyledons 

 flattish, foliaceous in germination. 

 C. Galactia. Calyx d-cleft. Vcxillum incumbent, broad, without callosities. Legume compressed, linear, many- 

 seeded. — Leaves pinnately trifoliolate. 



Subtribe 3. CLiTORiEa;. Ovary with several ovules. Vexillum large, not appcndiculate at the base. Inflores- 

 cence axillary : peduncles 1 - many-flowered, often cymose-fasciculate. 



7. Ct-ITORIA. Calyx tubular, 5-cleft at the summit. Vexillum not spurred on the back. Style longitudinally hairy. 



Legume stipitate, linear-oblong, torulose ; the valves nerveless.^ Twining herbs, with trifoliolate leaves and very 

 large flowers. 



8. AmphicarpjEa. Flowers of two kinds; upper ones perfect, in many-flowered racemes, the legume linear-oblong, 



3 - "l-secdod : lower flowers on prostrate branches (often subterraneous), imperfect or apctalous, producing obovatc 

 1 - 2-seeded legumes. — Twining herbs with trifoliolate leaves. 



Subtribe 1. Euph.aseole.^:, Benth. Ovary with several ovules. Style often indurated above 

 the yniddle. Vexillum with two appendages at the base. Cotyledons nearly 

 unchanged in germination. 



4. PHASEOLUS. Linn. ; Endl. gen. 6674. kidney bean. 



[Latin, phasclus, a little boat; from the form of the legumes.] 



Calyx campanulate, 5-toothed or 5-cleft; tlie 2 upper teeth often more or less united. Keel, 

 with the stamens and style, spirally twisted or circinate. Legume linear or falcate, more 

 or less compressed, or somewhat terete, many-seeded. Hilum small, oval-oblong, naked, 

 or rarely with a small membranaceous strophiole. — Herbaceous (in tropical countries often 

 suffrutescent), twining or trailing plants. Leaves pinnately trifoliolate : leaflets with con- 

 spicuous stipelles. Pedicels usually in pairs. 



