STUDIES ON THE VEGETATION OF ICELAND 
TABLE 6. 
Quantitative Distribution of the Species Groups in Iceland. 
i ———— 
29 
| | The | | | | | 
| lentire| A | E | A3 | A2 | A1 JEA E3 | E2|E1 
| flora | | 
number of species .. | ............ 375| 151| 224| 55 51) 45| 57| 53| 53| 61 
East Iceland. ....... absent — |27.5|18.6|33.5/18.2| 7.8|31.1|19.3 | 11.3 | 32.1 | 67.2 
| scattered-rare | 27.5 | 25.8 | 28.5 | 27.3 | 23.5 | 26.7 | 15.8 | 35.9 | 37.8 | 26.3 
| common 45.1 | 55.6 | 38.0 | 54.5 | 68.6 | 42.2 | 64.9 | 52.8 | 30.2| 6.6 
|| rn t , es || BT | Te 
North Iceland ...... | absent ZU 17.9 | 15:8: 1.220) Lot » | 5.7 | 18.9 | 44.3 
|| scattered-rare | 40.8 || 37.1 43.3 | 40.0 | 25.4 | 46.6 || 36.8 | 37.7 | 49.1 | 49 7 
common 47.5 | 60.3 | 38.8 || 58.2 | 72.6 | 48.9 | 63.1 | 56.6 | 32.1| 6.6 
North-West Iceland . | . absent 26.1 | 19.9 30.4 | 21.8 13:72 244 1122327132245: 6722 
| scattered-rare | 32.0 | 28.5 34.4 | 23.7 | 25.5 | 37.7 | 26.3 | 35.8 | 49.1 | 27.9 
| common 41.9 |51.7 | 35.3 | 54.5 | 60.8 | 37.8 |61.4 | 51.0 | 26.4 5.0 
South-West Iceland . | absent 16.3 | 15.9 | 16.5 | 21.8 | 11.8 | 13.3] 7.0! 3.8 | 17.0 | 36.1 
| scattered-rare | 37.3 | 30.5 | 42 0 | 23.7 | 23.6 | 46.7 | 28.1 | 37.7 | 45.3 | 55.7 
common 46.4 | 53.6 | 41.5 | 54.5 | 64.7 | 40.0 | 64.9 | 58.5 | 37.7 | 8.2 
South Iceland ...... | absent 17.6 | 19.9 | 16.1) 21.8 | 15.7 22.2 | 7.0| 9.4 | 18.9 | 27.9 
'scattered-rare | 37.3 | 27.8 | 43.8 | 23.7 | 23.6 | 37.8 | 33.3 | 39.6 | 45.3 | 55.7 
common 45.1 | 52.3 | 40.2 | 54.5 | 60.8 | 40.0 | 59.6 | 51.0 | 35.9 | 16.4 
| TTT 5-0. 0 absent 19.8 || 15.4 | 22.9 | 17.1 | 10.2 | 19.1| 9.1! 8.7 | 22.3 48.5 
scattered-rare | 35.0 | 30.0 | 38.4 | 27.7 | 24.3 | 39.1 | 28.1 | 37.3 | 45.3 | 42.9 
| common 45.2 | 54.7 | 38.8 | 55.2 | 65.5 | 41.8 | 62.8 | 54.0 | 32.5 | 8.6 
but conditions even in the lower areas of the highland tracts are 
unfavourable to this group. For E 4 this is not the case until we 
reach the upper areas of the highlands. In the lower highland tracts 
this group even seems to thrive better than in the lowlands. The 
same is the case with the subgroups of A. A 1 is mainly indifferent 
though it occurs most frequently in the lowlands, A 2 exhibits the 
highest percentage in the lower highland tracts, but in any case 
finds the upper highland tracts unfavourable, while A 3 shows the 
absolutely highest percentage in that area. 
Between A3 as one extreme and E 1 as the other the 
remaining groups show a fairly smooth gradation. 
In Stefän Stefänsson’s »Flöra Islands« it is stated for each spe- 
cies with what degree of commonness it occurs in each of the 5 parts 
