32 DIANDRIA— MONOGYNIA. Lemna. 



a central I'oot, of one or more pendulous, simple fibres, 

 each tipped with a cylindrical cai). Fl. rare, from a mar- 

 ginal cleft; buds [gemmce) most frequently supply their 

 place. 



» 

 1. L. trisulca. Ivy-leaved Duck-weed. 



Fronds stalked, elliptic-lanceolate, proliferous. 



L. trisulca. Linn. Sp. PL 1376. mihl v. 4. 193. Fl. Br. 95(5. 



Engl. Bot. i;. 13. ^.926. Hook. Lond. t.U9; Scot. 10. Fl. 



Dan. t. 1086. 

 Hydrophace n. 1901. Hall. Hist. v. 3. 69. 

 Lenticularia ramosa monorrhiza, foliis oblongis, pediculis longio- 



ribus clonatis. Mich. Gen. 16. t. 11./. 5. 

 Lenticula aquatica trisulca. Bauh. Hist. v. 3. 777. f. Baii Syn. 129. 

 Hederula aquatica. Lob. Ic. v. 2. 36./. Ger. Em. 830./. 



In clear still waters, very common. 



Annual. June. 



Fronds about half an inch long, acute, pale green, often waved or 

 toothed, proliferous laterally, so as to become repeatedly com- 

 pound, spreading at right angles. Fl. minute, white, with yel- 

 low anthers. Several flowers want the pistil, none the stamens^ 

 which latter are both at one side of the ger men. " Seed very 

 hard. Embryo simple, horizontal, (or rather transverse,) in • a 

 whitish, fleshy albumen.'' Hooker, whose figure and description 

 are worthy of their excellent author. 



2. L. minor. Lesser Duck- weed. 



Fronds obovate, flattish above and beneath. Roots solitary. 



L. minor. Unn. Sp. PL 1376. Willd. v. 4. 194. FL Br. 957. 



EngL Bot. V. 16. ^.1095. Hook. Lond. L 120. Scot. 11. FL 



Dan. L 1087. 

 Hydrophace n. 1900. HalL Hist. v. 3. 69. 

 Lenticula palustris vulgaris. Vaill. Par. 114. ^.20./ 3. 

 Lenticularia media, et minor. Mich. Gen. 16. t. 11./ 2, 3. 

 Lens palustris. Raii Syn. \29.t. 4. f. 1. Camer. Epit. 852. / Ger. 



Em. 829. / Vallisn. Op. v. 2. 88. L 14, 15. 



In ponds and ditches every where. 

 Annual. June, July. 



Fronds 2 or 3 lines long, floating in broad dense masses, some- 

 what aggregate, or proliferous. FL much like the last ; very rare. 



3. L. gibha. Gibbous Duck-weed. 



Fronds obovate ; slightly convex above ; hemispherical be- 

 neath. Roots solitary. 



