518 
MONOECIA DIANDRIA. 
Mich. 2. p. 165. Sp. pi. 4. p. 196. Pursh, 1. p. 3. Nutt. 2. p. 202. 
Root composed of short fibres, perennial? Stem coriaceous, two to three 
inches high, floating. Leaves alternate, many cleft, the segments somewhat 
pinnatifid and setaceous. Flowers axillary, solitary. The stamens sup- 
ported by a simple pedicel at the base of the germ. Filaments two, very 
short. Anthers two-celled. Germ ovate, surrounded by a few scales. 
Stigmas two, sessile. Capsule striate, two-valved, two-celled. Seed oval, 
numerous. 
Grows in the rocky beds of rivers — collected near Augusta, Georgia, by 
Dr. Leavenworth. 
Flowers — July. Pursh. 
LEMNA. 
Masculi — Calyx 1 - 
phyllus. Corolla 0. 
Foeminei — Calyx 1 
phyllus. Corolla 0. 
Stylus 1. Capsula 
unilocularis, disperma. 
Gen. Pe. 1400. 
Male Florets — Ca- 
lyx 1-leaved. Corolla 
0 . 
Female — Calyx 1 - 
leaved. Corolla 0. 
Style 1. Capsule 1- 
celled, two-seeded. 
1. Minor. 
L. foliis ellipticis, 
utrinque planis, basi 
cohaerentibus; radici- 
bus solitariis. 
Leaves elliptic, flat 
on both surfaces, cohe- 
ring at base; roots so- 
litary. 
Sp. pi. 4. p. 194. Walt. p. 227. Mich. 2. p. 1 63. Pursh, 1. p. 22. 
A small floating plant, sometimes nearly covering the surface of stagnant 
waters. Composed generally of one, two, or three leaves (more correctly 
fronds) laterally cohering yet each forming an entire plant. The margin of 
these fronds are slightly cleft, and in these fissures their very minute flowers 
are produced, or buds which form other fronds. Fronds somewhat thick, 
succulent, producing from the centre underneath a solitary root. Flowers 
very rare. Plant generally increasing by buds (gemmae.) 
Var.? Cyclostasa. 
L. foliis ellipticis, utrinque planis, 
in circulo coheerentibusj radicibus 
solitariis. 
Leaves elliptic, flat on both sur- 
faces, cohering in a circular arcj 
roots solitary. 
