374 
Tricotylous Races. 
cotylous seedlings from commercial seed of this pretty 
little annual (Fig. 79). I cultivated them and saved 
their seeds and in the following year planted out the 
variants and the atavists separately. There were 37 of 
the former group and 15 atavists. From the former 
there arose 28 flattened stems and branches ; from the 
Fig. 78. Tetragonia c.vpansa. A, branch split by forking; 
B, comb-like expanded terminal flower of a flattened 
main stem. 
latter only four, that is to say, a proportion of 75% and 
27% respectively. It should be mentioned that all the 
variants among the seedlings were planted out and that 
some of these gave rise to rather weak plants, whilst of 
the atavists I selected the strongest seedlings only. These, 
however, in spite of their greater individual strength and 
