LEGUMINOS^. (pulse FAMILY.) 103 



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

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

 ones panicled ; 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 struiglit on the ujrper 



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



10. D. Canadense, DC. Stem erect, hairy; leaves short-petiolcd ; 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 subsessilo. 



11. D. Dillenii, Darl. Stem erect, fun-owed, hairy ; leaflets oblong or 

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

 large, leafless, rough ; joints of the legume 3-4, triangular. (II. Marilandi- 

 cum, Ell.) — Open woods, Florida and northward. August. — Stem 2° -3° 

 high. Leaflets l'-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 sHghtly 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 hvteral 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 



obliquelg-obocate : flowers small. 



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

 cent above ; leaflets linear, reticulated, obtuse, smooth above, 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 nan-owly linear, rather 

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

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

 Mississippi, and northward. July- Sept. — Stem 2° -4° high. Leaflets lj'-3' 

 long. 



