THE GENOTYPICAL RESPONSE OF THE PLANT 231 
have been found to be smooth-leaved and much thinner than culti- 
vated plants of the inland type. When cultivated under ordinary field 
conditions, however, the hairiness and fleshiness of the leaves typical 
of the type are soon developed. 
c. The type of the eastern coast. This type includes both smooth- 
and hairy-leaved forms. The leaves, both of cultivated individuals and 
plants in the natural habitats, are usually thicker than those of the 
cultivated inland type. None have been found as thick-leaved as the 
west coast type. 
B. MATRICARIA INODORA. 
A succulent, halophytic variety of this species is known to syste- 
matists under the name var. maritima (L.). It differs also from the 
inland form growing as a weed throughout Sweden in being perennial 
and bushy in growth, in having bracts with broad, dark-coloured mar- 
gins and, usually, in having broader and shorter rays and less erect 
growth. It is for the rest rather variable as to the length and shape 
TABLE 2: 
| ne | : Thickness of 
Field | Position | Length of Place of Year of 
| > | leaf segments f à 
n:o | of stems leaf segments he collection collection 
1 Erect Long HS ADO Lund 1921 
2 Procumbent Short 965—1050 Hall. Väderö 1919 
3 Prostrate » | 1025—1230 | » » 
4 » » 915—985 | Kristineberg 1921 
5 Ascending Elongated 620—695 Stockholm 1920 
| 6 » » 635—745 | Västervik » 
of the leaf segments and rays, etc. (see NEUMAN, 1882). The different 
forms of this variety are common on the west and east coasts of Swe- 
den, and series of these forms have been transplanted from Hallands 
Väderö, Kullen and Kristineberg in Bohuslän (on the west coast) and 
from the islands off Stockholm, Karlskrona and Västervik (on the 
east coast). Some of the original plants have been divided and clones 
have been raised. Table 2 gives the characteristics of five of these 
clones (with 10—20 individuals in each) as seen in the cultures in 
1922, together with the place and year of collection. Field no. 1 re- 
presents the ordinary inland weed type growing on the same bed, and 
raised from seed collected in 1921 at Lund. 
There are additional differences between the clones, but those 
