Ill TETRANDRIA TETRAGYNIA. 



The leaves are of a thin delicate texture, a fine 

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

 paper. 



den/um 3. POTOMOGETON foliis ovatis acuminatis oppo- 

 fitis confertis, caulibus dichotomis, fpica qua- 

 driflora. Sp. pL 182. (Ger. Em. 823,/. 3) 

 LeiTer Water Caltrops, or Frog's-Lettuce. Jn^lis, 

 In ditches and rivulets : in the ditch on the right 

 hand of the walk going down the meadows near 

 Edinburgh. Dr. Parfons if.. VI. 

 The leaves at the tops of the branches are croudcd 

 clofe together, and not ferrated on the edges : 

 the footllaiks of the dowers rife out at the di- 

 vifion of the ftalks, and are very fliort and re- 

 JPxex'd. 



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

 Sp. ;pL 183. i^Oed. Dan. 195. opt. Fet. herb, t, 5. 



f.5-) 

 LonQ:-Ieav'd Pondweed. Anglis. 

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



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



mfpim K. P- fr^liis lanceolatis alternis undulatis ferratis. Sp^ 



pi. 183. Ger. Em. 824./. 2. Pet. her!?, t. 5./. 9^ 



Curicd Pondweed, or Greater Water Caltrops. 



Angiis. 

 Ik ditches and ponds frequent. % . VI. 

 The flalk. of this kind is greatly comprefs'd, and 

 varies with alternate and oppofite leaves, fo that 



the 



