mn 
DIANDRIA. MONOGYNIA. 19 
The Lemnas are minute aquatic plants, of an extremely 
simple structure, composed, at most, of 3 or 4 lenticular 
feaves, laterally adnate and proliferous, rarely flawering. 
Each leaf as a perfect plant, in aggregation, produces a 
single floating radicle, or, in some species, a small bun- 
dle ot fibres. * 
Species. 1. minor. 2. gibba. 3. thermalis, of Beauvors. 
4) trisulca. (The genus of this plant is doubtful.) 
Oss. Like many other aquatic plants the Lemnas are 
common to almost every country and climate; they even 
vegetate in the warmest thermal springs. 
