68 H. MOLHOLM HANSEN 
TABLE 158. 
Biological Spectra of the Jadar- and Myri Vegetation. 
Bontsssumeneree 11376 1404 | 1352 | 1360 1408 1076" 752 1004 | 1076 | 888 | 1032 
Number of species | 38 42 42 39 38 34 19 | 21 23 16 | 35 
Density of species | 13.8 14.0 13.5 | 13.6 | 141 10.8| 7.5| 10.0| 10.8 | .8.9| 10.3 
| | | | | 
7 34.8| 364 33.8 39.8! 47.2 50.0| 52.6 | 51.7 40.5 40.7 
APR ere 42 
Bier 57.3 65.2 63.6 66.2 60.2 52.8 50.0| 47.4 48.3 | 59.5| 59.3 
A3 20.1] 15.4! 14.5| 13.2| 15.3| 212) 16.5) 17.5| 16.0 DA 10.1 
NE | | | | | 
Mole, | 122! 68| 95) 10.6 11.6| 16.7| 16.5| 23.9| 24.5| 16.2) 182 
Ad | 10.5! 12.5! 124| 10.0! 12.8! 9.3! 17.0) 11.2| 11.2|14.0| 12.4 
BR | 
| | - 
DE CERN ET | 30.2 | 39.3 | 32.2| 45.5 | 39.8 | 32.7 | 36.2 | 33.9 32.0 41.9) 39.9 
DIS Battin i 8 | 15.4| 14.2| 12.7| 18.8 | 16.8| 16.4 13.8] 13.5| 16.4 |16.2| 14.0 
Da 21. 11.6| 11.7) 18.0] 2.1] 3.6) 37) >| »| >| 14754 
ES ER | > >| 0.6|| > » > || > > > » » 
| | | | 
eee [aes ier 
Qe veda cts ep 1122) 27.6) 16.9 215 28.7| 18.6 | 29.3 30.7 27.5 36.0 29.5 
Bhar Persea eho | 52.9 45.3 61.8 38.8 29.8) 34.2) 7.4 15.9) 15.2) 2.3| 15.9 
GESANDT | 33.7, 24.2 21.0 31.5 33.8 40.9, 60.1 47.8 47.6 48.6 | 41.9 
HAS eae ; 0.9) 26) 0.3) 8.2] 7.7) 5.9 | 32 5.6) 9.7 13.1) 12.8 
Dae een. 0.3! 0.3 » | 0.4 | » » | » » | > 
common to the dry and the + moist Cyperaceae myri. Carex Goode- 
noughü, C. chordorrhiza, and C. rariflora, besides Eriophorum poly- 
stachyum. Common to all three formations are Empetrum nigrum, 
Vaccinium uliginosum, Salix phylicifolia, Polygonum viviparum, and 
Thalictrum alpinum. 
The Betula nana Myri. Table 15 A—B, 7—11. 
In this formation the change from jadar to Salix myri has pro- 
gressed still further. The number and density of the species is 
appreciably diminished. H have decreased considerably and G 
have attained a maximum, The Ch and HH percentages have also 
risen. The species group spectrum has likewise undergone a change. 
The quantity of A species has increased somewhat, and in the A 
subgroups there is displacement from A 3 to A2 and Al. The E 
subgroups show a displacement in the direction of E 4. 
Physiognomically chamaephytes and Cyperaceae are dominant, 
thus of chamaephytes especially Betula nana, Vaccinium uliginosum, 
