136 LEGUMINOS^. (pulse family.) 



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

 grounds, W. Vermont to Wisconsin and southward, chiefly westward. — 

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

 glutinous hairs. 



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, smootliish. — Thickets : 

 common. — The conspicuous bracts and stipules j|' long. 



* * Stems (2° -5° high) erect: stipules as well as the bracts mostly deciduous, small 



and inconspicuous : pods of 3-5 triangular or half-rhombic or very unequal- 

 sided rhomboidal joints, which are longer than broad, £' or less in length. (Flow- 

 ers middle-sized.) 



9. D. lsevigatum, DC. Smooth or nearly so throughout : stem straight ; 

 leaflets ovate, bluntish, pale beneath (2' -3' long); panicles minutely rough- 

 pubescent. — Pine woods, New Jersey and southward. 



10. D. viridiflorum, Beck. Stem very downy, rough at the summit; 

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

 underneath (2' -3' long). — S. New York and southward. 



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

 commonly bluntish, pale beneath, softly and finely pubescent (mostly thin, 2' -3' 

 long). — Open woodlands : common. 



12. D. panic ulatum, 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. 



13. D. Striatum, DC. Stem very straight and slender, simple (p,°-3° 

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

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

 1-3, semi-obovate or very gibbous (only 2" long). — Pine woods of New 

 Jersey, and southward. 



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



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

 -«- Stems erect: bracts before flowering conspicuous : racemes densely flowered. 



14. D. Canadense, DC. Stem hairy (3° -6° high); leaflets oblong -lance- 

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

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

 {^'-\' long). — Dry, rich woods : common, especially northward. 



15. 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, Pennsylvania and Michigan to Illinois and southward. 



-t--t- Stems ascending (l°-3° high): bracts small; racemes or panicles elongated 

 and loosely flowered : flowers small. 



16. D. rigidum, DC. Stem branching, somewhat hoary, like the lower 

 surface of the leaves, with a close roughish pubescence; leaflets ovate-oblong, 

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

 the petiole. — Dry hillsides, Mass. to Michigan, Illinois, and southward. — In- 

 termediate, as it were, between No. 17 and No. 11. 



