112 LEGUMINOS^E. (PULSE FAMILY.) 



6. D. CUSpidatum, Torr. & Gray. Stem smooth, erect ; leaves smooth, 

 ovate or lanceolate-ovate, acuminate; panicle mostly simple, elongated; flow- 

 ers aud bracts large ; legume 4 - 6-jointed, the joints rhombic-oblong, con- 

 nected by a broad neck. Dry open woods. July -August. Stem 3 -5 

 high. Leaflets 3'- 5' long. Legume 1-J'- 2' long. 



7. D. viridiflorum, Beck. Stem stout, tomentose, rough above ; leaves 

 large ; leaflets ovate or roundish, obtuse, very rough above, pale and velvety 

 beneath ; stipules ovate, acuminate, rather small ; panicle large, leafless ; 

 legume 3 - 4-joiuted, on a stipe twice as long as the calyx, the joints half 

 orbicular, connected by a narrow neck. Rich open woods. August. Stem 

 3 - 4 high. Leaflets 2' - 4' long. Corolla turning greenish. 



8. D. OChroleucum, M.A.Curtis. Stems decumbent, hairy ; leaflets 

 smoothish, ovate, reticulate ; stipules large, ovate ; racemes elongated ; corolla 

 whitish ; legumes twisted, 2 -4-joiuted, the large joints rhomboid, smooth. 

 North Carolina, and northward. 



9. D. humifusum, Beck. Nearly glabrous; stem prostrate; leaflets 

 ovate, mostly obtuse, thin, faintly veined, I'-H'long; stipules small, lance- 

 olate; flowers small, purple ; joints of the legume 3-4, triangular, minutely 

 scabrous. Open woods, Tennessee, and northward. 



10. D. rotundifolium, DC. Stem long, trailing, hairy; leaflets or- 

 bicular, pubescent; stipules ovate, large, reflexed; racemes simple, the termi- 

 nal ones panic-led ; lobes of the calyx longer than the tube ; legume 2 - 4-jointed. 

 very adhesive, the large joints half-rhombic. Dry open woods. August. 

 Stem 3 -5 long. Flowers showy, occasionally yellowish white. 



* * Stipules subulate, deciduous: legume 3 5-jointed, nearly straight on the 

 upper suture, the joints triangular, rarely rounded on the lower suture. 



11. D. Canadense, DC. Stem erect, hairy; leaves short-petioled ; 

 leaflets oblong-lanceolate, more or less hairy; panicle leafy; flowers and 

 bracts large ; legume with 3 - 4 rather large obtusely 3-angled joints. Dry 



w Is in the upper districts. August.* Stem 2-3 high, furrowed. Upper 



leaves subsessile. 



12. D. Dillenii, Darl. Stem erect, furrowed, hairy; leaflets oblong or 

 ovate-oblong, obtuse, smoothish above, paler and pubescent beneath ; panicle 

 large, leafless, rough ; joints of the legume 3-4, triangular. Open woods, 

 common. Aiigust. Stem 2 -3 high. Leaflets l'-2' long. Bracts and 

 flowers small. 



13. D. glabellum, DC. Stem erect, nonrly glabrous; leaflets small, 

 ovate, obtuse, scabrous-pubescent on both sides; joints of the legume about 4, 

 triangular, minutely hispid. In shadv places, North and South Carolina. 

 Resembles D. Marilandicum in foliage and D. paniculatum in fruit. 



14. D. laevigatum, DC. Stem smooth, terete: leaflets thick, ovate, 

 obtuse, smooth, or slightly pubescent and paler beneath ; panicle leafless, 

 rough; joints of the legume 3-4, triangular. (II. rliombifolinm, Ell.) 

 Dry rich soil. August. Stem 2- 4 high. Leaflets 1 ' - 2' long, the lateral 

 ones occasionally wanting. 



