34 



PLANT HABITS AND HABITATS IN THE 



action to conditions of poor soil-aeration. The first noticeable effect 

 of oxygen deprivation to the roots of Coleus sp. is the cessation of the 

 absorption of water (Free and Livingston, 1915 : 60). This is followed 

 by a cessation of growth and ultimate wilting of the shoot. 



<^J^//^///^////^/^/^^y/^/////y ^^^^ 



Fig. 10.— Chief physical divisions and geographical plan of South Australia, after Howchin and 

 Gregory, with the 6, 10, and 16 inch isohyets. 



