Table 3. Vegetation found in sedge-whitetop potholes, 

Oseurrence Average Average 

‘Species . (Percent of percentage ef density* 
potheles) vegetation zonet 
Fluminea festucacea 100 ks I - II 
Carex spp. . 100 Tal II 
Lema trisulca | 96 65 II 
Lemna minor 96 28 I - II 
Typha latifolia 68 3 I-H 
Eleocharis sp. - Juncus sp. hh 8 II 
_ Hordeum _jubatum 36 18 II 
Scirpus validus 2k 
Green algae 20 
Salix spp. 16 
Petamogeton spp. 12 
Sc acutus 12 
Sium suave 8 
Myriophylium spp. 8 
Becknannia sysigachne h 
Utricularia vulgaris 4 
Phragmites communis \ 
Glyceria spp. h 

# Listed only when eccurrence was over 30 percent, 

The vegetation of these potholes varied considerably both in density 
and the extent to which the plants grew in clumps in the deeper water, Pure 
stands of whitetop were generally more dense and solid than were mixtures of 
whitetop and sedge er pure stands of sedge which tended to grow more sparsely 
and form clumps. The vegetation of a typical type Al pothole (No. 0) is 
shown in Plate IV. ; ; 
