60 DIALYPETALOUS EXOGENS 



t f Stipules (and bracts) large: legumes of 2 or 3 to 6 joints. 



8. D. rigidum, DC. Roughish-pubescent; leaflets ovate-oblong, 

 rather obtuse, thickish and subcoriaceous, scabrous above, hairy 

 and canescent beneath. 



RIGID DESMODIUM. 



Stem 2 to 3 feet high, paniculate at summit, often with long erect branches. 

 Leaflets 1 to 3 inches long, ciliate, and reticulately veined ; common petioles % of an 

 inch to an inch in length. Racemes elongated, the branches rough with uncinate 

 pubescence. Joints of the legume mostly 2 or 3, resembling those of D. ciliare. 

 Hob. Dry, open woodlands, and clearings : frequent. Fl. Aug. Fr. Sept. 



9. D. CUSpidatlim, Torr. $ Gr. Smooth ; leaflets lance-ovate, 



acute or acuminate ; panicle elongating; bracts conspicuously acu- 

 minate. 



D. bracteosum. DO. $ FL Cestr. ed. 2. p. 416. 

 CUSPIDATE DESMODIUM. 



Stem 3 to 5 feet high, rather stout, simple or sparingly branched. Leaflets 2 to 5 

 inches long; common petioles 1 to 3 or 4 inches in length. Racemes long and rather 

 slender. Flowers rather large. Joints of the legume 4 to 6, triangular-oblong, 

 strongly and reticulately veined, uncinately hispid and tenacious, especially along 

 the margins. 

 Hob. Along shaded rivulets; thickets, &c.: frequent. FL Aug. Fr. Sept. 



10. D. viridiflomm, Beck. Stem very pubescent, uncinately 

 hirsute at summit; leaflets ovate, mostly obtuse, scabrous above, 

 softly villous beneath ; flowers bluish-green externally. 

 GREEN-FLOWERED DESMODIUM. 



Stem 3 to 4 feet high, rather stout, paniculately branching. Leaflets 2 to 4 inches 

 long, bluish glaucous beneath ; common petioles half an inch to an inch in length, 

 very hairy. Flowers violet-purple within, turning blue-green in withering ; ra- 

 cemes paniculate, long and leafless. Joints of the legume usually 3 or 4, obtusely 

 triangular, uncinately pubescent. 

 Bab. Woodlands, and thickets : frequent. Fl. Aug. Fr. Sept. 



11. D. canescens, DO. Stem hairy and scabrous; leaflets 

 ovate, acute or subacuminate, scabrous on both sides, glaucous and 

 reticulated beneath ; panicle large, very hairy and canescent. 

 HOARY DESMODIUM. 



Stem 3 to 4 or 5 feet high, stout and branching. Leaflets 2 to 4 inches long, often 

 subdeltoid, acuminately tapering to the apex ; common petioles 1 to 3 or 4 inches 

 long. Racemes terminal and axillary, on leafy branches. Joints of the legume 

 mostly 5 or 6, rhomboid or oblong-triangular, reticulately veined, uncinately hispid. 

 Hob. Moist grounds; thickets, &c.: frequent. Fl. July. Fr. Sept. 



2. STEM prostrate : racemes short, axillary and terminal. 



12. D. rotlindifolium, DC. Hairy all over; leaflets orbicu- 

 lar, the terminal one subrhomboid, larger; stipules large, obliquely 

 ovate, reflexed; racemes few-flowered. 



ROUND-LEAVED DESMODIUM. 



Stem 2 to 4 feet long, slender, trailing, somewhat branched. Leaflets 1 to 2% 

 inches in diameter, thin, ciliate, somewhat glaucous beneath ; common petioles 1 to 

 3 inches long. Flowers in axillary pedunculate racemes, and also in a loose slen- 

 der terminal panicle. Joints of the legume 3 to 5, subrhomboid, tenaciously hispid. 

 Hob. Rocky woodlands : frequent. Fl. Aug. Fr. Sept. 



