THE GENOTYPICAL RESPONSE OF THE PLANT 291 
to the west coast dune form in this respect, and the same holds true 
as regards the power of regeneration in autumn, which equals, if it 
does not surpass, that of the latter form. The considerable length of 
the leaves of these plants should also be noted. Series of the Sand- 
hammar form have also been collected on the dunes at Löderup on 
the southern side of the drift-sand region. These series show exactly 
the same characteristics. The extent of the area covered by the H. 
umbellatum form in question has also been determined. It extends 
from a little to the west of Löderup on the south side to a point on 
the east side due east of Kylsgard; the form covers, in other words, 
almost exactly the area occupied by the drift-sand. The prostrate dune 
form of the north 
and the Sandham- 
mar form of the 
south meet on the 
beach at Kylsgard, 
and series from 
this place show a 
strongly mixed po- 
pulation. These 
latter series have 
only been in cul- 
ture during one 
vegetation period 
and are therefore 
not tabulated 
here: however, no Fig. 55. H. umbellatum. 
doubt remains as 
to the mixed character of the series in question. The H. umbellatum 
population at Kylsgard will be referred to once more in a later chapter. 
A dune form from the interior of the province has also been loca- 
ted. This is found growing on the lacustral dunes at Vombsjön near 
Oved station together with Carex arenaria, Elymus arenarius, Coryne- 
phorus, etc. Table 24 (list no. 34; fig. 55) gives the results of the 
cultivation of a series from this locality cultivated since 1920. It 
should be said that the ordinary, erect inland form grows abundantly 
close by, for instance at Skartofta, at a distance of about 4 kilometres 
from the lake locality. 
Cult. dune type from Vombsjön. 
Hereditas III. 20 
