122 TETRANDRIA TETRAGYNIA. 



The leaves are of a thin delicate texture, a fine 

 green color, and tranfparent like a piece of oil'd 

 paper. 



denfum 3. POTOMOGETON foliis ovatis acnminatis oppo- 

 fitis confertis, caulibus dichotomis, fpica qua- 

 driflora. Sp. pi. 182. {Ger. Em. ^1^, f. 3) 



Leffer Water Caltrops, or FrogVLettuce. An^lis. 



In ditches and rivulets : in the ditch on the right 

 hand of the walk going down the meadows near 

 Edinburgh. Dr. Parfons %. VI, 



The leaves at the tops of the branches are crouded 

 clofe together, and not lerrated on the edges : 

 the footflalks of the flowers rife out at the di- 

 vifion of the llalks, and are very lliort and re- 

 flex'd. 



lucens 4. P. foliis lanceolatis planis in petiolos definentibus. 

 Sp. pi 18^. {Ocd. Ban. 195. opt. Pet. herb. t. 5. 



/• 5.) 



Long-leav'd Pond weed. Anglis. 

 In rivers and lakes frequent, as in Dudijlon-Loch, 

 near Edinburgh, &c. Dr. Parfcns. % . VII. 



trifpiim 5. P.- foliis lanceolatis alternis undulatis ferratis. Sp. 



pi. 183. 'fier. Em. 824./. 2. Pet. herb. t. s- f- 9) 



Curled Pondweed, or Greater Water Caltrops. 



Anglij. 

 In ditches and ponds frequent, if. VI. 

 The llalk of this kind is greatly comprefs'd, and 

 varies with alternate and oppofite leaves, fo that 



the 



