618 MONOECIA DIANDRIA. 



Mich. 2. p. 165. Sp. pL 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. 



Flpwers — July. Pursh. 



LEMNA. Gen. Pl. 1400. 



I 



Masculi — Calyx 1- I Male Florets— Ca- 

 phyllus. Corolla 0. lyx 1 -leaved. Corolla 



Foeminei — Calyx 1 I 0. 

 phyllus. Corolla 0. Female — Calyx 1- 

 Styhis 1, Capsula leaved. Corolla 0* 

 imilocularis, disperma. I Style 1. Capsule 1- 



I celled, two-seeded. 



1. Minor. 



f 



L. foil is ellipticis, 1 Leaves elliptic, flat 



utrinque planis, basi on both surfaces, colie- 

 cohaerentibiisj radici- ring at base; roots so- 

 bus solitariis. | litary. 



* 



Sp. pl. 4. p. 194. Walt p. 227. Mich. 2. p. 163. Pursh, 1 . p. 22. 



stagnant 



waters. Composed generally of one, two, or three leaves (more correctly 

 fronds) laterally cohering yet each forming an entu-e 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. Frmds 



7 



underneath a solitary root. Fhicers 



very rare. Flant generally increasing by buds (gemnic-e.) 



^ 



Var.? Cyclostasa. 



L. foliis elfipticis, utrinque planis, j Leaves elliptic, flat on both sur- 

 in circulo cohecrentibusj radicibus I faces, cohering in a circular arcj 

 solitariis. I roots solitary. 



