80 MOXADELPHIA, DECANDRIA. 



Species. 1. A. fcoideuin. 2. polygonoides. A common 

 weed in the streets of Charleston and New-Orleans. 



A tropical genus of about 26 species, chiefly ii.digenous 

 to India, with a few in Africa and meridional America. 



II.— OCTANDRIA. 



473. PISTIA. L. 



Cali.T, spatha tubulously ciicullatc, lingulate. 

 Corolla none. Filaments lateral; anthers 3 to 8. 

 Style 1. Capsule 1-celied, many-seeded. 



A floating- aquatic; leaves all radical, expanded in a cir- 

 cle; flowers axillar}-, subsessilc, solitar}^, white. 



Species. 1. P. spathdafa. In Carolina. Probably a 

 mere variety of P. Stratiotes, which is indigenous to Asia, 

 Africa, and America, being- a genus of a single species. 



III.— DECANDRIA. 



474. GERANIUM. X. 



Calix a-leaved. Petals 5 ^ .regular, JS^eda- 

 riuin 5 melliterous glands adnate to the base of 

 the longer filaments. Jirilliof 1 -seeded, awned, 

 awns naked and straight. 



Herbaceous, rarely slirubby; leaves mostly opposite 

 and palmately lobed; peduncles axiUaiy, 1 or 2-flowered. 



Species. 1. G.'maculatum. 2. carohyuannm. 3. cobimhi- 

 num. 4. dissectum. 5. robertiaiuivv This species possesses 

 the same peculiar scent as in Europe. 



An extensive genus, principally European. 



475. ACACIA. WilliL jSIimosa. i. 

 Polygamou.^. — Calix tubulons, 5-to()thed. Pe- 

 tals 5. Stamina 5 to 10, exserted. Legume 1- 

 celled, 2-valved. 



Shrubby or herbaceous; leaves once or twice pinnate; 

 flowers mostly capitate. 



Species. I. k. brachyloba. 2. g'andulcsa. Z.famcslana 



