98 LEGUMINOSJS. (PULSE FAMILY.) 



long and close spikes (4' -9'); pods ovoid-oblong, coriaceous, completely 2- 

 celled, li River-banks, common from N. New York westward July- Aug. 



4. A. dit6rtUS, Torr. & Gray. Low and spreading, branched from the 

 base, smoothish ; leaflets 1 1 - 23, oblong or obovate ; flowers purplish or violet, 

 10-20 in a short spike, the standard deeply notched at the summit; pods ob- 

 long, turgid, incurved (' long), coriaceous, incomplete]^- 2-cclled. ty Mason 

 Co., Illinois, Dr. Mead. May. (Also in Arkansas and Texas.) 



$ 3. Pod dry and dehiscent, \-celled, or incompletely 2-celled by the projection of the 

 ventral (seed-bearing) suture. (Pliaca, L. t DC.) 



5. A. Cooperi. Nearly smooth, erect; leaflets 11-21, elliptical or ob- 

 long, somewhat notched at the end, minutely hoary underneath ; peduncles about 

 the length of the leaves ; flowers white ; pods not stalked in the calyx, globose-ovoid, 

 inflated, thinnish (|' long), pointed, grooved at the two sutures, which are both turned 

 inwards, but especially the inner. 1J. (Phaca neglecta, Torr. fr Gray.} Grav- 

 elly banks of rivers, &e., W. New York to Wisconsin. June, July. Plant 

 l-2 high, greener and less coarse than A. Canadcnsis, with pure white flowers 

 in shorter and more open spikes : calyx shorter. (Named for William Cooper, 

 Esq., the discoverer: there being an A. neglectus.) 



6. A. Rob1>illSii. Nearly smooth and erect (1 high) ; slender; leaflets 

 7-11, elliptical, often notched; peduncles much longer than the leaves; raceme 

 loose, nearly 1-sided in fruit; flowers white (4" long) ; pods hanging, stalked in 

 the calyx, oblong, boat-shaped, obtuse, the seed-bearing- suture convex, the other 

 nearly straight. (Phaca Robbinsii, Oakes.) Rocky ledges of the Onion River, 

 near Burlington, Vermont, Dr. Bobbins (1829). (Allied to Phaca austratis, L. 

 &c.) June. Pods 6" -7" long, 1-celled, papery and veiny, smooth, the 

 outer suture often slightly turned inwards. See addend. 



15. JESCHYNOMENE, L. SENSITIVE JOINT VETCH. 



Calyx 2-lipped; the upper lip 2-, the lower 3-cleft. Standard roundish : keel 

 boat-shaped. Stamens diadelphous in two sets of 5 each. Pod flattened, com- 

 posed of several square easily separable joints. Leaves odd-pinnate, with sev- 

 eral pairs of leaflets, sometimes sensitive, as if shrinking from the touch (whence 

 the name, from alo~xyvofjievT), being ashamed). 



1. JK. hispida, Willd. Erect, rough-bristly; leaflets 37-51, linear, 

 racemes 3 - 5-flowered ; pod stalked, 6 - 10-jointed. CD Along rivers, S. 

 Penn., Virginia, and southward. Aug. Flowers yellow, reddish externally. 



16. HEDYSARUM, Tourn. HEDYSARUM. 



Calyx 5-cleft, the lobes awl-shaped and nearly equal. Keel nearly straight, 

 obliquely truncate, not appendaged, longer than the wings. Stamens diadel- 

 phous, 9 & 1. Pod flattened, composed of several equal-sided separable round- 

 ish joints connected in the middle. Leaves odd-pinnate. (Name composed of 

 jjdvs, sweet, and apco/za, smell. . 



1. H. tooreale, Nutf. Leaflets 13-21, oblong or lanceolate, nearly 

 glabrous ; stipules scaly, united opposite the petiole, raceme of many deflexcd 



