THE GENOTYPICAL RESPONSE OF THE PLANT 255 
teristics are also seen in individuals collected in the natural habitat. 
Another point of difference from the preceding type is the colour 
of the leaves, which is almost always bluish-green in the praecox-type 
but dark green in the Sound type, both cultivated and »wild». The 
branching habit, which in the praecox-type is ascending-erect, is often 
procumbent, or even prostrate, in the Sound type. The margin of the 
leaves as well as of the bractlets may vary as in the case of praecox, 
but it is most often entire. Fig. 27 (field no. 45) shows one of the 
ascending-erect biotypes and fig. 28 (field no. 30) one of the prostrate 
ones, both isolated and pure cultured from the original Limhamn 
Fig 28. Atriplex sarcophyllum from the Sound; field no. 30. 
Prostrate form. Pot 12 cm. high. 
plants. It should be said that long-stalked fruiting bractlets are 
also developed when the plants are allowed to develop in sand culture. 
Two individuals, one from a pure culture of field no. 45, the other 
a pure culture of the Kastlösa-praecox (see above) were isolated within 
the same pergamin bag in 1920 with the object of procuring hybrids 
between the two types*. A large number of seeds were obtained and 
sown, and 60 individuals from these cultures were isolated in 1921. 
Only one of these isolated plants has shown segregation this year, 
the rest are either typical no. 45 or typical Kastlösa-praecox. The 
* Castrations, unfortunately, cannot be made in the genus Atriplex because 
of technical difficulties. 
