32 DTANDRIA— MONOGYNIA. Lemna. 



a central i-oof, of one or more pendulous, simple fibres, 

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

 ginal cleft; bicds {gemma;) most frequently supply their 

 place. 



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

 Fronds stalked, elliptic-lanceolate, proliferous. 



L. trisulca. Linn. Sp. PI. 137(J. Willd. v. 4. 193. H. Br. 956. 



E72gl. Bot. V. 13. t.92G. Hook. Lond. f. 119 ; Scot. 10. Fl. 



Dan. t. 1086. 

 Hydrophace n. 1901. Hall. Hist. u. 3. fi9. 

 Lenticularia ramosa monorrhiza, foliis oblongis, pediculis longio- 



ribus donatis. Mich. Gen. \.G. t.\ \.f. 5. 

 Lenticula aquatica trisulca. Bauh. Hist. v. 5. 777 -f. RaiiSijn. 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 hoth at one side of the gcrmen. " 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. 



h. minor. Li?m. Sp. PL 137C. Willd. v. 4. 19-1. Fl. Br. 9.57. 



Engl. Bot. v. 16. <.1095. Hook. Lond. t. 120. Scot. 11. Fl. 



Dan. t. 1087. 

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

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

 Lenticularia media, et minor. Midi. Gen. IG. t. 1 1./. 2, 3. 

 Lens palustris. Raii Syn. 129. t. 4.f.\. 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 hroad dense masses, some- 

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



3. L. gibba. Gibbous Duck-weed. 



Fronds obovate ; slightly con^•ex above ; hemispherical be- 

 neath. Roots solitary. 



