LEGUMINOS^E. (PULSE FAMILY.) 139 



2. D. aCUminatum, DC. Leaves all crowded at the summit of the stem 

 from which arises the elongated naked raceme or panicle ; leaflets round-ovate, 

 taper-pointed, green both sides, the end one round (4-5' long). Ilich woods, 

 from Canada to the Gulf. 



3. D. pauciflorum, DC. Leaves scattered along the low (8-15' high) 

 ascending stems ; leaflets rhombic-ovate, bluntish, pale beneath ; raceme few- 

 flowered, terminal. Woods, Ont. to Penn., Mich., Kan., and southward. 



2. Pod raised on a stalk (stipe) little if at all surpassing the deeply cleft calyx; 

 stems long and prostrate or decumbent ; racemes axillary and terminal. 



* Stipules conspicuous, ovate, attenuate, striate, persistent ; racemes mostly simple. 



4. D. rotundifolium, DC. Soft-hairy all over, truly prostrate ; leaflets 

 orbicular, or the odd one slightly rhomboid ; flowers purple ; pods almost equally 

 sinuate ou both edges, 3 - 5-jointed ; the joints rhomboid-oval. Dry rocky 

 woods, N. Eng. to Ha., west to Minu., Mo., and La. 



Var. glabratum, Gray, is almost glabrous, otherwise nearly as the ordi- 

 nary form. Mass, and N. Y. 



5. D. OChroleucum, M.A.Curtis. Stems sparsely hairy, decumbent; 

 leaflets nearly glabrous, ovate, acute or obtuse, transversely reticulated be- 

 neath, the lateral ones smaller or sometimes wanting ; racemes much elongated ; 

 corolla whitish ; pods twisted, 2 - 4-jointed, the large rhomboid joints smooth and 

 reticulated but the margins downy. Woodlands, Md. and Va. 



* * Stipules smaller, lanceolate and awl-shaped, less persistent; racemes panided. 



6. D. humifusum, Beck. Glabrous or nearly so, procumbent ; leaflets 

 ovate or orate-oblong, rather obtuse, much smaller than in the two preceding 

 (1 J - 2' long) ; corolla purple ; pods 2 - 4-jointed, flat, the oval-rhomboid joints 

 minutely scabrous throughout. Dry sandy soil, S. Penn. to Md. 



3. Pod slightly if at all stalked in the calyx; racemes panided. 



* Stems tall (3 - 5) and erect ; the persistent stipules and deciduous bracts large 

 and conspicuous, ovate or ovate-lanceolate, taper-pointed ; flowers rather large. 



-- Pods of 4-7 unequal-sided rhombic joints, which are considerably longer than 



broad (about 6" long). 



7. D. can^SCens, DC. Stem loosely branched, hairy; leaflets ovate, 

 bluntish, about the length of the petioles, whitish and reticulated beneath, both 

 sides roughish with a close fine pubescence ; joints of the pod very adhesive. 

 Moist grounds, Mass, and Vt. to Minn, and southward, chiefly westward. 

 Branches clothed with both minute and hooked, and longer, spreading, rather 

 glutinous hairs. Var. viLLOsfssiMUM, Torr. & Gray, has the panicle and upper 

 part of the stem very villous, and leaflets oblong-ovate. Mo. 



8. D. cuspidatum, Torr. & Gray. Very smooth except the panicle ; stem 

 straight; leaflets lanceolate-ovate and taper-pointed, green both sides, longer 

 than the petiole (3-5'); joints of the pod rhomboid-oblong, smoothish. 

 Thickets, common. The conspicuous bracts and stipules ' long. 



<- -i- Pods of 3-5 oval joints (not over 3" long). 



9. D. Illinoense, Gray. Erect (3-5 high) ; stem and leaves with short 

 rough pubescence ; leaflets ovate-oblong or ovate-lanceolate (2 - 4' long), obtuse, 

 subcoriaceous, cinereous beneath, veins and veinlets prominent, strongly retic- 



