3*2 DIANDRIA— MONOGYNIA. Lemna. 



a central root, of one or more pendulous, simple fibres, 

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

 ginal cleft ; buds (gemrnee) most frequently supply their 

 place. 



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

 Fronds stalked, elliptic-lanceolate, proliferous. 



L. trisulca. Linn. Sp. PL 13/0. mild. v. 4. 193. Fl. Br. 956. 



Engl. Bot. v. 13. t. 926. Hook. Load. t. \\9 -, Scot. 10. Fl. 



Dan. t. 1086. 

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

 Lenticularia ramosa monorrhiza, foliis oblongis, pediculis longio- 



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

 Lenticula aquatica trisulca. Bauh. Hist. v. 3. 777./. RaiiSyn. 129. 

 Hederula aquatica. Lob. lev. 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 germen. " 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. Linn. Sp. PI. 13/6. Willd. v. 4. 194. Fl. Br. 957. 



Engl. Bot. v. 16. t. 1095. Hook. Loud. t. 120. Scot. 11. FL 



Dan. t. 1087. 

 Hydrophace n. 1900. Hall, Hist. v. 3. 69. 

 Lenticula palustris vulgaris. Vaill. Par. 114. t. 20. f. 3. 

 Lenticularia media, et minor. Mich, Gen. \6. t. 1 \.f. 2, 3. 

 Lens palustris. Raii Syn. 129. t. 4./ 1. Camer. Epit. 852. /. Ger. 



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



In ponds and ditches every where. 

 Annual. June, July. 



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

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



3. L. gibba. Gibbous Duck- weed. 



Fronds obovate ; slightly convex above ; hemispherical be- 

 neath. Roots solitary. 



