i 
- TETRANDRIA TETRAGYNIA, | 
_ POTAMOGETON. Gen pl 174. 
Cal.o. Petala 4. Stylus 0. Sem. 4. 
1. P. foliis oblongo-ovatis petiolatis natantibus. Sp. pi. 
ooo. 
Broad-leav’d Pondweed. 3 
Nat, of Britain. : — 
Fi, Auguft, aa H. 2. 
2. P. foliis cordatis amplexicaulibus. Sp. pl. 182. 
Perfoliate Pondweed. 
Nat. of Britain, 
Fi, June and July. H. 2. 
3 P, foliis ovatis acuminatis oppofitis confertis, caulibus 
dichotomis, fpica quadriflora. Sp. pl. 182. 
_ Forked Pondweed, or Leffler Water-caltrops. 
Nat. of Britain, 
Fi, June. so ie | Pe 
4 P. foliis lanceolatis planis in petiolos definentibus. 
Sp. pl. 183. 
Shining Pondweed. 
Nat, of Britain. 
Fi. June. ; H. a 
5- P. foliis lanceolatis alternis oppofitifve undulatis ferratis. 
Syft. veget. 169. — Curtis lond. 
Curl’d Pondweed, or Greater Water-caltrops. 
Nat. of Britain. 
Fl. May and June. H. Y. 
‘6 P. foliis linearibus obtufis, caule compreflo, Sp. p/. 183. 
Flat-ftalk’d Pondweed. 
Nat. 
natans; 
perfolia~ 
tum. 
% 
denfium, ‘ 
' 
+ 
lucens. 
