LEGUMINOS.E. (PULSE FAMILY.) 103 



9. D. rotundifolium, DC. Stem long, trailing, hairy ; leaflets orbicu- 

 lar, pubescent ; stipules ovate, large, reflexed ; racemes simple, the terminal 

 ones paniclcd ; lobes of the calyx longer than the tube ; legume 2 - 4-jointed, 

 very adhesive, the large joints half-rhombic. Dry open woods, Florida to Mis- 

 sissippi, and northward. August. Stem 3 - 5 long. Flowers showy, occa- 

 sionally yellowish-white. 



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



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



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

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

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

 North Carolina, and northward. August. Stem 2 - 3 high, furrowed. Up- 

 per leaves subsessile. 



11. 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. ( II. Marilandi- 

 cnm, Ell.) Open woods, Florida and northward. August. Stem 2 -3 

 high. Leaflets 1' 2' long. Bracts and flowers small. 



12. D. glabellum, DC. Stem erect, nearly glabrous; leaflets small, 

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

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

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



13. D. laevigatum, DC. Stem smooth, terete ; leaflets thick, ovate, ob- 

 tuse, smooth, or slightly pubescent and paler beneath ; panicle leafless, rough ; 

 joints of the legume 3-4, triangular. (H. rhombifolium, Ell.) Dry rich 

 soil, Florida to Mississippi, and northward. August. Stem 2 -4 high. 

 Leaflets l'-2' long, the lateral ones occasionally wanting. 



14. D. paniculatum, DC. Stem slender, mostly smooth, with long and 

 virgate branches ; leaflets varying from oblong to linear-lanceolate, obtuse, 

 smooth or slightly pubescent ; legume 3 - 5-jointcd, the joints triangular. 

 Shady woods, Florida to Mississippi, and northward. August. Stem 2 - 4 

 high. Leaflets rather rigid. 



* * * Stipules subulate, deciduous: legume 2-3-jointed; the joints small, oval, or 



obliquely-obovate : flowers small. 



15. D. tenuifolium, Torr. & Gray. Stem slender, erect, rough-pubes- 

 cent above ; leaflets linear, reticulated, obtuse, smooth above a keeled, much longer 

 than the short petiole ; panicle leafless, very rough ; flowers small ; legume ses- 

 sile, mostly 2-jointed. Dry pine barrens, Florida to North Carolina. July and 

 August. Stem 2 - 3 high. Leaflets 2' - 3' long. 



16. D. Strictum, DC. Stem erect, mostly simple, straight and slender, 

 smooth or roughish ; leaves on slender petioles ; leaflets narrowly linear, rather 

 obtuse, coriaceous, reticulated, nearly smooth ; panicle virgate, few-flowered ; the 

 pedicels very slender ; legume stipitate, 1 -3-jointed. Pine barrens, Florida to 

 Mississippi, and northward. July- Sept. Stem 2 -4 high. Leaflets 1^'- 3' 

 long. 



