138 LEGUMINOS^. (PULSE FAMILY.) 



composed of several easily separable joints. — Leaves odd-piunate, with several 

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

 the name, from alax^^'^f^^'^V, heing ashamed.) 



1. I^. hispida, Willd. Erect, rough-bristly annual ; leaflets 37 - 51, lin- 

 ear ; racemes few-flowered ; flowers yellow, reddish externally ; pod stalked, 

 6- 10-jointed. — Along rivers, S. Fenu. to Fla. and Miss. Aug. 



25. C O R O N I L L A, L. 



Calyx 5-toothed. Standard orI)icular; keel incurved. Stamens diadelphou!-\ 

 9 and 1. Pod terete or 4-angled, jointed ; the joints ol)l()ng. — Glabrous herbb 

 or shrubs, with pinnate leaves, and the flowers in umbels terminating axillary 

 peduncles (Diminutive of corona, a crown, alluding to the inflorescence.) 



C. vXria, L. a perennial herb with ascending stems ; leaves sessile ; leaf- 

 lets 1.5 - 25, oblong ; flowers rose-color ; pods coriaceous, .3 - 7-jointed, the 4-an- 

 gled joints 3 ~ 4" long. — Conn, to N. J. (Nat. from Eu.) 



26. HEDYSARUM, Tourn. 



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

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

 phous, and 1. I'od flattened, composed of several equal-sided separable 

 roundish joints connected in the middle. — Terennial herbs*, leaves odd-pin- 

 nate. (Name composed of tj^vs, sa-eet, and ^poi/uLa, smell.) 



I. H. boreale, Nutt. Leaflets 13-21, oblong or lanceolate, nearly gla- 

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

 purple flowers ; standard shorter than the keel ; joints of the pod 3 or 4, smooth, 

 reticulated. — Lab. to northern Maine and Vt. ; north shore of L. Superior, and 

 north and westward. 



27. DESMODIXJM, Desv. Tick-Trefoil. 



Calyx usually more or less 2 lipped. Standard obovate ; wings adherent to 

 the straight or straightish and usually truncate keel, by means of a little trans- 

 verse appendage on each side of the latter. Stamens diadelphous, 9 and 1, or 

 monadelphous below. Pod flat, deeply lobed on the lower margin, separating 

 mto few or many flat reticulated joints (mostly roughened with minute hooked 

 hairs, by which they adhere to the fleece of animals or to clothing). — Per- 

 ennial herbs, with pinnately 3-foliolate (rarely 1-foliolate) leaves, stipellate. 

 Flowers (in summer) in axillary or terminal racemes, often panicled, and 2 or 

 3 from each bract, purple or purplish, often turning green in withering. Stip- 

 ules and bracts scale-like, often striate (Name from dea-ftoi, a bond or chain, 

 from the connected joints of the pods.) 



§ 1 Pod raised on a stalk (stipe) manij times longer than the slightli/ toothed 

 calyx and nearly as long as the pedicel, straightish on the upper margin, deeply 

 sinuate on the lower ; the I -4 joints mostly half-obovate and concave on the 

 back; stamens monadelphous below ; plants nearly glabrous : stems erect or 

 ascending; raceme terminal, panicled ; stipules bristle-form, deciduous. 



1. D. nudiflorum, DC Leaves all crowded at the suinmit of sterile stems : 

 leaflets broadly ovate, bluntish, whitish beneath ; raceme elongated on an ascend- 

 ing mostly leaf ess stalk or scape from the root, 2° long. — Dry woods, common. 



