STUDIES ON THE VEGETATION OF ICELAND 113 
TABLE 24B. 
Biological Spectra of the Myri and Floi Vegetation. 
Points sum 944 | 768 | 840 | 840 || 436 | 404 | 496 | 504) 504 || 276 | 196 | 212 | 248 
Number of 
species .. 23 | 27 | 22 | 20 11 10), 71071213 12 5 8 10 6 
Density of | | 
species .. | 9.4] 7.7| 84| 84 | 4.4] 4.0] 5.0] 5.0] 5.0 | 28| 20) 21| 25 
‘115 ee 51.3 64.1 55.2 53.8 | 67.9 66.3 70.2 | 65.1 | 62.7 | 7.2 | 49.0 | 45.3 | 38.7 
Bee =>: 48.7 53.9 44.8 46.2 | 32.1 | 33.7 | 29.8 | 34.9 | 37.3 92.8 | 51.0 | 54.7 | 61.3 
Be... 35.2 49.0 19.0 | 37.6 25.7 40.6 | 36.3 | 42.9 | 20.6 | 7.2 20.4 | 41.5 | 11.3 
Be wi» 14.0| 13.5) 5.7| 13.3 | 22.9 24.8 20.2 19.8 | 19.8 > 10.2) 1.9|27.4 
Se 211 16 0.5 | 2.9 ||19.3| 1.0/13.7| 2.4|22.2 184 | 1.9 
> à ID m rn = I if | 
48.7 | 35.9 | 43.8 44.7 | 30.3 | 33.7 | 10.5 | 34.9| 37.3 | 49.3 | 51.0 | 54.7 | 54.8 
BY... »| 10) 14 19 »|1194| »| 43.5 | 6.5 
> PNR : 
sn... | >» 
Bar... 26.7 27.1 23.3 | 32.9 | 10.1 19.8 | 16.9 15.9 7.9 »|143| 5.7! 4.8 
ae 26.7 | 28.6 | 31.0 | 16.7 | 8.3| 8.9| 11.3 | 13.5 | 13.5 | 13.0 > | 32.1 | 14.5 
a ere 45.7 43.8 45.2 48.6 79.8 71.2 52.4 70.6 78.6 79.7 85.7 62.3 74.2 
Be... | » >| 05| 14] 1.8 » | 19.4 » » | 7.2 > » 65 
7. | 0.8! 0.5 >| 0.5 > » » » » 
damp soil, the Carex rariflora myri on damper soil, and the Erio- 
phorum polystachyum fléi on the dampest ground. In table 24 A, 
Nos. 1—4 represent the knolly myri, 5—9 the Carex rariflora myri, 
and 10—13 the flöi. 
The knolly Carex myri is most abundant in species and shows 
the greatest density of species of the myri formations. The number 
of species is 23, and the density 8.5. Ch play a more prominent 
part here than in the jadar and attain a relative maximum of 27.5 
per cent. H show a strong decrease, while the rise in G is still 
continuing; the last Th meet with the first HH. The species group 
spectrum shows a large content of A3 and E 4 species. 
The physiognomie dominants are the chamaephytes and the 
Cyperaceæ, of the chamaephytes especially Salix herbacea, S. glauca, 
and S. phylicifolia, further Empetrum nigrum and Vaccinium uligi- 
nosum, of the Cyperaceæ Eriophorum polystachyum, Carex rigida, 
C. dioica, C. rariflora, and here and there Carex alpina and C. sax- 
The Botany of Iceland. Vol. II. 8 
