THE GENOTYPICAL RESPONSE OF THE PLANT 283 
dune form starts a few kilometres north of Bastad and runs through 
the whole southern and middle parts of the province, occupying its 
usual habitat in the epilittoral belt of the beach. It is succeeded by 
the cliff form somewhere between Falkenberg and Varberg. Three 
series of the sand dune form are tabulated here, viz. list no. 7 from 
Halmstad (table 12), situated between Bastad and Falkenberg, and list 
nos. 5 and 6 from the latter place (table 11, fig. 46). List no. 5 includes 
some rather broad leaved individuals to be discussed more fully in the 
following. Fig. 44 (the plant to the extreme left) shows a plant be- 
longing to the inland form (list no. 31) collected about 10 kilometres 
_to the east of Falkenberg in the inland, where the dune form typical of 
the beach is entirely wanting. The cliff form takes the place of the dune 
Fig. 48. H. umbellatum. Cult. cliff type from Kristineberg. 
form somewhere north Of Falkenberg, as stated above. Fig. 47 shows 
a typical plant from the series from Varberg cultivated since 1920 (list 
no. 4). On the rocky coast of Bohuslän the cliff form is the only 
one hitherto found. List nos. 1, 2 and 3 refer to cultivated series from 
this coast strip (figs. 48, 49). The first two series have been tabulated 
in table 10. While as a whole these series much resemble the former 
cliff form series, some characteristics, for instance the width of the 
leaves, seem to differ. The leaves in rather many of the individuals 
are of less than the average width in former cliff form series. This 
is probably due to the fact that the series in question have been in cul- 
ture only for a relatively short time, or since 1921. The plants were 
all more narrow-leaved at the time of transplanting from their natural 
habitat. The average width of ten leaves on each of the first five in- 
dividuals of list no. 1 were ascertained in 1921 at the time of collecting; 
