J 18 DIADELPHIA. DECANDRIA. 



or racemose (GalactiaP) Calix mostly bibracteate at the 

 base. 



Species. 1. C. virginiana. The largest papiUonaceous 

 flower in the United Slates. 



2- Plumieii. Stem twining"; leaves ternate, ovate-oblong, 

 acuminate, calix campanulate, shorter than the ovate 

 bractcs; corolla larg-e, sericeous. Persoon, Syn. 2. p 303. 

 Legume very long (and narrow). Carina particularly to- 

 mentose. Hab. v. v. Around New Orleans. 

 , 3. mariana. PYom Pennsylvania to Carolina. On the 



banks of the Schuylkill 2 miles from Philadelphia, but> 

 rare. Obs. Legume smooth and torulose, about 3-seed- 

 ed, and rather short; flowers by pairs, large and pale blue, 

 stem erect or twining at the summit; leaves ternate, ovate, 

 acute, paler beneath; partial bractes subulate, conspicu- 

 ous; calix tubular-campanulate, 5-cleft, much longer thau 

 the bractes. 



A genus of 11 species indigenous to tropical America, 

 except C. mariana and 2 species in India; C virginiana 

 is also indigenous to Jamaica and St. Domingo. 



520. ROBFNIA. L. (Locust Tree.) 



Calioc small and campanulate, 4-cIeft, upper 

 segment bifid. Legume compressed and elonga- 

 ted, many-seeded, seeds compressed, small. 



Trees or shrubs wilh pinnated leaves, (in Caragana 

 abruptly pinnated), stip^iles cauiine and partial, small, or 

 setaceous, peduncles mostly axillary, racemose. Stigma 

 villous above. 



Species. 1. R. Pstf^Jacac/a. (White Locust-tree.) 2. 

 viscosa. 3. Idspida. 



Excluding Caragana, the rest of this genus of 15 spe- 

 cies is almost exclusively indigenous to tropical America, 

 the only exceptions are 1 species in India, and another 

 in China. 



521. INDiGOFERA. L, (Indigo.) 



Calix spreading, 5-tootlied. Carina on either 

 side, near the base, producing a subulate spread- 

 ing spur (or denture). Legume linear, rather 

 small, terete or quadrangular. 



Herbaceous or shrubby; leaves simple, binate, ternate, 



quinate oc pinnate; stipules cauliiie, minute, general and^ 



