LEGUMINOS^. 87 



A. monoica Torr. <^ Gr. : racemes of the petaliferous flowers nodding ; 

 teeth of the calyx short and broad, somewhat triangular ; bracts shorter 

 than the pedicels. A. monoica and A. sarmentosa Ell. Glycine monoica, 

 comosa and hracleata Linn. 



Woods. Can. to Flor. W. to Louis. July, Aug. %..— Stent slender, twi- 

 ning, 3 — 3 feet long, more or less liairy. Leaves ternate ; leafets rhombic or 

 oblong-ovate. Flowers pale purple, in shortly peduncled racemes, some of them 

 under ground and imperfect. Common Hog-nut. 



23. APIOS. BoerL—GTound-Nut. 

 (From the Greek airios, a, pear ; in allusion to the form of its tuberous roots.) 



Calyx campanulate, obscurely 2 -lipped ; the upper lip of 2 

 short rounded teeth. Standard very broad, with a longitudinal 

 fold in the centre, reflexed. Keel long, falcate, and with the 

 stamens and style at length spirally twisted. Legume some- 

 what terete, slightly falcate, many-seeded. 



A. tuberosa Mcench. Glycine Apios Linn. 



Low grounds. Can. to Flor. W. to Miss. July, Aug. %. — Root producing 

 oval tubers about half an inch in diameter. Stem 4 — 8 feet long, slender, 

 climbing. Leafets mostly in fives, ovate-lanceolate, acuminate, on short hairy 

 petioles. Flowers in short oval racemes, purple and green. 



Ground-nut. Wild Bean. 



24. PHASEOLUS. Linn.— Kidney Bean. 

 (From the Latin phaselus, a little boat ; on account of the form of the legume.) 



Calyx campanulate, 5-cleft or 5-toothed ; the two upper teeth 

 more or less united. Keel, stamens and style, spirally twisted, 

 or rarely incurved. Legume linear or falcate, more or less 

 compressed, many-seeded. 



1. P. perennis Walt. : stem twining, pubescent; leafets ovate, acuminate, 

 3-nerved ; racemes soUtary or somewhat clustered, simple or somewhat 

 branched, longer than the leaves ; legume pendulous. P. paniculatus 

 Mich. Dolichos polystachyos Linn. 



Dry woods. Can. to Flor. W. to Miss. July. %.—Stem 4—10 feet long, 

 climbing. Leafets 2 — 3 inches long. Flowers purple, in numerous racemes 

 which are from 4 — 10 inches long. Wild Kidney Bean. 



2. P. diversifoliiis Pcrs. : stem prostrate ; leafets broad-ovate, angular, 

 2 — 3-lobed ; peduncles angled, longer than the leaves ; flowers in heads ; 

 bracts ovate ; legume linear, terete, subpendulous, pubescent, 6 — 7-seeded. 

 P. trilobus Mich. Strophostyles angulosa Ell. Glycine angulosa Muhl. 

 in WiUd. 



Woods. Can. to Flor. Aug. (£). — Stem prostrate and a little scabrous, 

 2 — 6 feet long. Leafets more or less distinctly 3-lobed. Flotvers 4 — 8, purple, 

 on peduncles 4 — 6 inches long. Various-leaved Kidney Bean. 



3. P. helvolus Linn. : stem slender, hairy backwards ; leafets ovate, ob- 

 long, usually entire, about the length of the petiole ; stipules lanceolate ; 

 peduncMB slender, 3 — 6 times as long as the leaves; flowers few, in heads ; 



