564 



Plate XXXIII. 



Greneral birdseye view over sandhill region looking west 

 towards the Nullarbor Plain, whicli is seen on the horizon, taken 

 from the top of a water tower 30 ft. above the crest of a sand 

 ridge. In foreground sandhill mulga (A. Unophylla) running to a 

 flat with lleterodendron. Another low sand ridge is between this 

 and the plain, where is mulga (A. aneura) and some Casuarina 

 lepidopliloia in dongas, e.g., extreme right. 



Plate XXXIV. 



Fig. .1. Typical sand ridge mallee vegetation. The mallees 

 are Eucalyptus oleosa, E. leptophylla, and E. tronscontinentalis. 

 The tree in the centre is Myoporum 'platycarpum. Shrubs, Acacia 

 ligulata, A. Uandelliana, and Cassia eremophila. The ground at 

 this season is almost bare. This probably represents the climax 

 on sandhills. 



Fig. 2. View in "oak forest, ■■ showing old trees of Casuarina 

 lepidophloia with some natural regeneration. Bushes of Acacia 

 Mandelliana and Fusanus acuminatus. Ground at this time almost 

 bare : the dead undershrubs appeared to be Kochia scdifoUa. 



Plate XXXV. 



Sandhill flora showing earh^ stages in the succession in the 

 foreground and looking across to mallee on the horizon. The trees 

 in the foreground on either side are Grevillea stenohotnju. Below 

 open sandhill succession with Leptospermum laevigatum, v. minus, 

 Acacia ligulata, and Dodonaea viscosa, v. attenuata. The dis- 

 tant vegetation is mallee of the sandhill climax. 



Plate XXXVI. 



Fig. 1. General view over salt lake to mallee-covered hills 

 on horizon. The foreground shows open sandliill succession with 

 Acacia ligulata and Fusanus acuminatus. The halophytic shrubs 

 of the dr}' salt lake are seen round the margin and in the bed 

 at the nearer and shallower end. Beyond the lake can be seen 

 the halophytes, some passing into open sandhill flora, behind which 

 is mallee. The branch of the tree in the immediate foreground, 

 left side, is Grevillea stenohotrya, and illustrates tlie leaf habit. 

 The tree is fruiting. 



Fig. 2. Salt lake near Soak showing dry bed with no vege- 

 tation. Arthrocnemum, spp., form a fringe l>etween the bed of 

 the surrounding sandhills on which Acacia linopliylla and Fusanus 

 acuminatus can be seen. 



