160 VEGETATION OF THE PEAK DISTRICT [CH. 
In In non- 
calcareous | caleareous 
waters waters 
Charophyta 
Chara fragilis vr — 
C. hispida vr — 
C. vulgaris vr vr 
Nitella opaca l ] 
Angiospermae 
Polygonum amphibium i *vr 
*Nuphar lutea l — 
*Nymphaea alba ] a 
*Ceratophyllum demersum —- vr 
Ranunculus circinatus vr — 
R. fluitans la — 
R. pseudofluitans la a 
R. trichophyllus vr —— 
R. Drouettii vr — 
R. peltatus (agg.) r = 
R. Baudotii vr a 
“Callitriche verna” (U) vr *vr 
C. stagnalis (U) a a 
C. hamulata vr vr 
C. obtusangula vr vr 
Myriophyllum spicatum r *vr 
*M. alterniflorum — vr 
“Hippuris vulgaris ” vr vr 
*Apium inundatum — — 
*Littorella juncea — —- 
Potamogeton natans ) 0) 
*P. perfoliatus vr 
P. crispus wr *vy 
*P. obtusifolius — vr 
*P. zosterifolius — -— 
*P. pennsylvanicus — vr 
P. pusillus ] l 
*P, Friesii -- *vr 
*P. pectinatus — vr 
Zannichellia palustris vr *vr 
*Sagittaria sagittifolia — vr 
*Elodea canadensis (U) la la 
Lemna minor (U) la la 
*L. trisulca — vr 
*Heliocharis acicularis — vr 
“Catabrosa aquatica” vr — 
Glyceria fluitans (U) a a 
G. plicata (agg.) la vr 
