80 MONADELPHIA. DECANDRIA. 
Species. 1. A. ficoideum. 2. polygoncides. A common 
weed in the streets of Charleston and New-Orleans. 
A tropical genus of about 26 species, chiefly indigenous 
to India, with a few in Africa and meridional America. 
——a—— 
Il.—OCTANDRIA. 
473. PISTIA. L. 
Calix, spatha tubulously cucullate, lingulate. 
Corolla none. Filaments lateral; anthers 3.to 8. 
Style 1. Capsule 1-celled, many-seeded. 
A floating aquatic; leaves all radical, expanded in a cir- 
cle; flowers axillary, subsessile, solitary, white. 
Species. 1. P. spathulata. In Carolina. Probably a 
mere variety of P. Stratiotes, which is indigenous to Asia, 
Africa, and America, being a genus of a single species. 
ae 
I1I.—DECANDRIA. 
474, GERANIUM. L. 
_ Calix 5-leaved. Petals 5, regular. Necta- 
rium 5 melliferous glands adnate to the base of 
the longer filaments. .frilli 5, 1-seeded, awned, 
-awns naked and straight. 
Herbaceous, rarely shrubby; leaves mostly opposite 
and palmately lobed; peduncles axillary, 1 or 2-flowered- _ 
Spectres. 1. G. maculatum. 2. carolinianum. 3. columbi- 
num. 4, dissectum. 5. robertianum. This species possesses 
the same peculiar scent as in Europe. 
An extensive genus, principally European. ‘ 
lygamous.—Calix tubulous, 5-toothed. Pe- 
{ tals 5. mina Sto 10, exserted. Legume t- 
_ Shrubby or herbaceous; leaves once or twice pinnate A 
flowers mostly capitate. Seg 
— Sracinp.1. A. brachyloba. 2. glandulosa. 3. farnesiana. 
475 
