98 LEGUMIXOSjE. (pulse family.) 



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

 cellcd. lj. — River-banks, common from N. New York westward July -Aug. 



4. A. distwi'NlS, Torr. & Gray. Low and spreading, branched from the 

 base, smoothish; leaflets 11-23, 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, incompletely 2-cellcd. 1J. — Mason 

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



$ 3. Pod dry and dehiscent, l-celled, or incompletely 2-ceUed bij the projection of the 

 ventral [seed-bearing) suture. (Phaca, L., DC.) 



5. A. Coopd'i. Nearly smooth, erect; leaflets 11-21, elliptical or ob- 

 long, somewhal notched at the end, minutely hoary underneath ; peduncles alout 

 the lentjth of the leaves; fl* >ers white; pods not stalked in th< calyx, globose-ovoid, 

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

 inwards, but especially the inner. U (Phaca neglecta, Torr. $• Gray.) — Grav- 

 elly banks of rivet . W. New York to Wisconsin. June, July. — Plant 

 lo.oo high, greener and less coarse than A. Canadensis, with pure white flowers 

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

 Esq., the disc there being an A. neglectus.) 



6. A. KoI»?»iSisii. Nearly smooth and erect (1° high) ; slender; leaflets 

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

 loose, nearly l-sidcd in fruit; {lowers white (4" long); pods hanging, stalked in 

 the calyx, oblong, boat-sliaped, 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). | to Phaca austratis, . 

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

 outer suture often slightly turned inwards. 



15. JESCII YJV03IEIVE, 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-\vvopei'n, being ashamed). 



I. JE. lilspicla, Willd. Erect, rough-bristly; leaflets 37-51, linear; 

 racemes 3-5-Howered; pod stalked, 6 - 10-jointed. (l —Along rivers, S. 

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



16. HEDTSABUM, Tourn. Hedtsaeum. 



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 

 fjbvs, sweet, and «pco/xa, smell.) 



1. II. boi'ciale, Nutt. Leaflets 13-21, oblong or lanceolate, nearh 

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



