THE GENOTYPICAL RESPONSE OF THE PLANT 247 
The branching types usually found in A. Babingtonii are the as- 
cending and the procumbent ones (fig. 19). The prostrate (fig. 20) 
type is less common. No biotype characterized by wholly erect growth 
has yet been isolated. 
C. ATRIPLEX PATULUM L. 
This species has been considered to be one of the most variable 
‘in the genus, and forms presumably adapted to live on cultivated 
ground, on sandy shores, and on rocky shores, etc. have been di- 
stinguished and named by systematists. I have shown in a previous 
paper (Turesson, 1919 b) that the great variability assumed by some 
TABLE 4. 
Field | Position of Position of Leaves with or LE as 
à 5 2 terminal part of | Bractlets 
no. main axis | basal branches without scurf 
2 the basal leaves 
6 Erect Ascending Almost without | Denticulate Small 
1 » » » Entire » 
8 » Procumbent With Dentate » 
3 » Prostrate Almost without Entire » 
4 » » Without » » 
5 » » Almost without | Denticulate » 
209 | Prostrate » With Entire » + 
211 » » Without » » 
212 » » » » Leafy 
writers to be peculiar to A. patulum has been due to a confusion of 
this species with forms belonging to another species, which is strictly 
confined to the salt water shores. This species will be dealt with in 
the following. 
A. patulum, on the contrary, is a typical anthropophyte, which 
only goes down on the beach in places, where cultivated fields are 
close by or where refuse and rubbish has collected. Autogamy seems 
to be the rule in this species, and numerous biotypes, different as to 
branching habit, leaf character, bracilets etc., are easily raised, when 
different mother-plants are isolated. A great number of such isola- 
tions were made in 1916 and 1917. A few of the resulting pure 
cultures are still kept. Table 4 shows the combination of the most 
important characters realized in these different pure cultures. 
Fields nos. 6 and 3 are shown in figs. 21 and 22, and field nos. 5 
and 209 in fig. 24 (the main axis of this type is erect but it is sooner 
