140 LEGUMINOS^. (pulse FAMILY.) 



ulated, the lower leaflets nearly equalliug the petiole ; pods scarcely over 1 ' long, 

 sinuate on both margins (deeper below). — Dry ground, 111. to Iowa and Kan. 



* * Stems (2-5° higli) erect ; stipules and bracts mostly deciduous, small and 



inconspicuous ; joints of the pod 3-5, triangular or half-rhombic or verij un- 

 equal-sided rhomboidal, longer than broad, 3" or less in length ; flowers 

 middle-sized. 



10. D. Isevigatum, DC. Smooth or nearly so throughout ; stem straight ; 

 leaflets or«/e, bluntish, pale beneath (2-3' long); panicles minutely rough- 

 pubescent. — Pine woods, N. J. to Fla., west to Mo. and Tex. 



11. D. viridiflorum, Beck. Stem ren/ downy, rough at the summit; 

 leaflets broadly ovate, very obtuse, rough above, ivhitened with a soft velvety 

 down underneath (2-3' long). — Southern N. Y. to N. J. and Ha., west to 

 Mich., Mo., and Tex. 



12. D. Dillenii, Darlingt. Stem pubescent ; leaflets oblong or oblong-ovate, 

 commonly bluutish, pale heuea.th, softly and jinely pubescent, mostly thin (2-3' 

 long). — Open woodlands, common, 



13. D. paniculatum, DC. .Nearly smooth throughout; stem slender, 

 tall ; leaflets oblong -lanceolate, or narrowly lanceolate, tapering to a blunt point, 

 thin (3-5' long) ; racemes much panicled. — Copses, common. 



14. D. Strictum, DC. Stem very straight and slender, simple (2-3° 

 high), the upper part and narrow panicle rough-glandular ; leaflets linear, blunt, 

 strongly reticulated , thickish , very smooth (1 -2' long, ^' wide) ; joints of the pod 

 1-3, semi-obovate or very gibbous (only 2" long). — Pine woods, N. J. to 

 Fla. and La. , 



* * * Stipules small and inconspicuous, mostly deciduous : pods of few roundish 



or obliquely oval or sometimes roundish-rliomboidal joints, 1^-2^" long. 

 -t- Stems erect; bracts before flowering conspicuous; racemes densely flowered. 



15. D. Canadeuse, DC. Stem hairy (3-6° high) ; leaflets oblong -lanceo- 

 late or ovate-lanceolate, obtuse, with numerous straightish veins, much longer 

 than the petiole (l-|-3' long) ; flowers showy, larger than in any other species 

 (^-y long). — Dry rich woods, N. Brunswick to N. C, Minn., and Kan. 



16. D. sessilifblium, Torr. & Gray. Stem pubescent (2-4° high); 

 leaves nearly sessile ; leaflets linear or linear-oblong, blunt, thickish, reticulated, 

 rough above, downy beneath ; branches of the panicle long ; flowers small. — 

 Copses, Penn. and Ky., west to Mich., Iowa, Mo., and Tex. 



t- -i- Stems ascending {\ -3° high); bracts small ; racemes or panicles elongated 

 and loosely flowered ; flowers small. 



17. D. rigidum, DC. Stem hra.nch\ns;, somewhat hoary, like tlie lower 

 surface of tlie leaves, with a close roughisli pul)esceuce ; leaflets ovate-oblong, 

 blunt, thickish, reticulated-veiny, rather rough above, the lateral ones longer than 

 the petiole. — Diy hillsides, Mass. to Fla., west to Mich., Mo., and La. 



18. D. ciliare, DC. Stem slender, hairy or rough-jmbescent ; leaves 

 crowded, on very short hairy petioles ; leaflets round-ovate or oval, thickish, more 

 or less hairy on the margins and underneath (^-^1' long). — Dry hills and 

 sanily fields, N. Eng. to Fla., west to Mich., Mo., and Tex. 



19. D. Marilandicum, F. Boott. Nearly smooth throughout, slender, 

 leaflets ovate or roundish, very obtuse, thin, the lateral ones about the length of 



