250 GOTE TURESSON 
prostrate type will similarly take on the habitus shown by the lower 
plant in fig. 23, which is a modification of the upper plant (field 
no. 209) and is raised in sand culture. These prostrates become even 
more stunted and dwarfed when growing as a weed in the corn-fields 
of southern Sweden; they often do not exceed 10 cm. when spread out. 
The different biotypes occur almost indiscriminately through 
southern and middle Sweden in cultivated places. There is one habitat, 
however, which has been found to exclude all types which do not 
Fig. 24. Atriplex patulum, field no. 5. 
show a prostrate habit of growth. In the stubble-fields of southern- 
most Sweden, where A. patulum grows as a weed, only the prostrate 
races of the species are found, together with other annuals low in sta- 
ture, such as Anagallis, Odontites, Euphorbia exigua, Stachys arvensis 
etc. The offspring from isolated mother-plants collected in the stubble- 
fields might vary as to all other characters, in the shape of the leaves, 
in characters of leaf margin, in the size of the bractlets, etc., but they 
all show the prostrate habit of growth. They escape, apparently, the 
fatality which inevitably meets the erect races in this habitat, viz. that 
of being cut down and deprived of fructification. 
