86 
Life-form and species 
Erect Shrubs: 
Cassiope tetragona 
Salix lanata 
Total 
Prostrate shrubs: 
Dryas integrifolia 
Salix arctica 
Salix ovalifolia 
Salix reticulata 
Salix rotundifolia 
Total 
Cushion and mat dicots: 
Astragalus umbellatus 
Cerastium beeringianum 
Minuartia arctica 
Minuartia rossti 
Oxytropis nigrescens 
Saxifraga oppositifolia 
Silene acaulis 
Total 
Single dicots: 
Androsace chamaejasme 
Braya spp. 
Cardamine digitata 
Cardamine pratensis 
Caltha palustris 
Chrysanthemum integrifolium 
Draba alpina 
Hippuris vulgaris 
Lesquerella arctica 
Lloydia serotina 
Melandrium apetalum 
Oxyria digyna 
Papaver macounii 
Parrya nudicaulis 
Pedicularis capitata 
Pedicularis lanata 
Pedicularis sudetica 
Polygonum viviparum 
Potentilla hookeriana 
Ranunculus pedatifidus 
Saussurea angustifolia 
Saxifraga cernua 
Saxifraga hirculus 
Senecio atropurpureus 
Stellaria laeta 
Valeriana capitata 
Total 
1(10) 
0.1 
0.1 
48.7 
0.1 
0.1 
2.9 
0.6 
52.4 
0.1 
0.1 
0.1 
9.4 
OF 
0.1 
0.8 
0.3 
0.2 
0.1 
1.0 
0.1 
0.4 
0.1 
3.2 
2(10) 
0.4 
0.1 
0.5 
59.8 
6.1 
0.2 
2.1 
0.1 
68.3 
0.6 
0.1 
1.8 
25 
0.1 
0.5 
0.1 
0.1 
0.3 
0.1 
0.2 
0.3 
0.2 
0.1 
0.1 
2.6 
3(10) 
0.5 
0.5 
20.0 
8.0 
2.6 
25 
33.1 
0.6 
0.6 
0.1 
0.2 
1.3 
0.2 
1.8 
Table 2 
Plant composition of the vegetation types recognized within the Tundra Biome study area 
at Prudhoe Bay, Alaska. Values are means of percentage cover estimates from a variable 
number of 1m? quadrats. These data are still preliminary and not all species encountered 
have been included. No attempt has been made to arrange the rows and columns in any 
ecological sequence. 
Vegetation type (number quadrats per type) 
4(10) 
0.1 
0.1 
0.2 
0.2 
0.5 
0.5 
0.5 
2.0 
2.5 
5(10) 
0.1 
0.1 
6(10) 
0.8 
1 
2.3 
8(10) 
0.2 
0.1 
6.1 
6.4 
0.1 
0.1 
0.1 
0.2 
0.2 
0.1 
0.2 
0.2 
0.1 
0.1 
3) 
9(3) 
16.0 
16.0 
23.3 
0.2 
SL. 
35.8 
61.0 
0.1 
13 
8.3 
9.7 
0.2 
0.3 
0.2 
1.0 
0.2 
10(3) 
5.8 
5.8 
18.3 
6.1 
11(4) 
12 
0.1 
45 
23.1 
28.9 
13.0 
8.8 
0.1 
15.0 
12(8) 
0.1 
0.1 
0.1 
25 
2.8 
0.6 
6.0 
0.6 
0.1 
0.1 
0.1 
1.4 
0.1 
0.6 
3.1 
13(6) 
42.6 
42.6 
0.1 
6.4 
0.8 
18.3 
0.8 
26.4 
0.1 
0.1 
0.9 
0.1 
0.7 
0.7 
0.1 
1.6 
7.6 
