LEGtJMiNOS^. (rULSE 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 rouud-ovate, 

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

 from Canada to the Gulf. 



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

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

 flowered, terminal. — Woods, Ont. to Penn., Mich., Kan., and southw^ard. 



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

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



* Stipides 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 equalh' 

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

 woods, N. Eng. to Fla., west to Minn., Mo., and La. 



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

 nary form. — Mass. and N. Y. 



0. D, OChroletlCUm, 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 doAvny. — Woodlands, Md. and Va. 



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



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

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

 (lJ-2' long) ; corolla purple ; pods 2 -4-jointed, flat, the oval-rhomboid juints 

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



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



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

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



-1- Pods of ■^-l unequal-sided rhombic joints, which are considerably longer than 



broad (about 6" long). 



7. D. canescens, 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. — ^lo. 



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. lUinoense, 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 veiulets prominent, strongly retic- 



