ILLUSTRATIONS. 



PLATES. 



1, A. View looking north from O'Halloran's Mount, Oodnadatta, showing lower plain 



with upper plain at the extreme right in background. 



B. Lower plain near Oodnadatta, showing "gibbers" on the surface and typical de- 

 pression with species of Eremophila. 



2, A. Eremophila freelingii in a shallow wash on the slope of upper plain near Oodnadatta. 

 B. Eremophila freelingii in a shallow wash on the edge of upper plain west of Neales 



River, Oodnadatta. 



3, A. Acacia cambadgei in a shallow wash on the slope connecting upper and lower plains 



west of Neales River, Oodnadatta. 

 B. Shoot-tips with leaves, Eremophila freelingii, from upper plain west of Neales River, 



Oodnadatta. 

 c. Shoot-tips with leaves, Eremophila latrobei, from a wash connecting upper and lower 



plains west of Neales River, Oodnadatta. 



4, A. Acacia tetragonophylla, near west base of sandhills east of Oodnadatta. 

 B. Acacia linophylla on sandhills east of Oodnadatta. 



c. Short channel, Neales River, with Eucalyptus rostrata and Acacia stenophylla, small 

 shrubs, on the banks, Oodnadatta. 



5, A. Phyllodia of Acacia linophylla from sandhills near Oodnadatta. 

 B. Eremophila neglecta near base of sandhills east of Oodnadatta. 

 c. Neales River bottoms from the lower plain, Oodnadatta. 



6, A. Shoot-tips and phyllodia of Acacia tetragonophylla, left, and A. cambadgei, right, 



from Neales River, Oodnadatta. 

 B. Leaves and phyllodia of Acacia stenophylla from Neales River, Oodnadatta. 



7, A. Prominent development of horizontal roots in Acacia cambadgei, Neales River, 



Oodnadatta. 



B. Vegetative reproduction in Acacia stenophylla from floodplain, Neales River, Oodna- 

 datta. 



c. Kochia sedifolia on low slope above Copley Plain on Yudnamutana road, Copley. 



8, A. Zygophyllum fruticosum at edge of Copley Plain by Table Mountain. The trees in 



the background are Casuarina lepidophloia , Copley. 



B. Nitraria schceberi hillock colonies on Copley Plain. Table Mountain is in the back- 

 ground at left, Copley. 



c. Detail of edge of colony of Nitraria schceberi, showing horizontal prostrate branches 

 by which the hillock colony is extended. Copley. 



9, A. Shoot-tip of Eremophila freelingii from low hills on Mount Series road, Copley. 



B. Eremophila oppositifolia, showing leaves and flowers, from rounded low hills on 



Mount Series road, Copley, 

 c. Pholidia scoparia, "broom, " from low hills on Mount Series road east of Copley. 



10, A. Cassia sturtii, constituting a mono-specific community on Mount Series road, Copley. 

 B. Mono-specific community of Eremophila freelingii, in low hills along Mount Series 



road, Copley. 



c. Mono-specific community of Pholidia scoparia in low hills on Mount Series road, 

 Copley. 



11, A. Hakea leucoptera on southern slope of Table Mountain, Copley. 



B. Casuarina lepidophloia, or "oak," at south base of Table Mountain, Copley, 

 c. Community of Zygophyllum fruticosum near Mount of Light, Copley. 



12, A. Petalostylis labicheoides from south base of Table Mountain, Copley. 

 B. Casuarina lepidophloia, Copley. 



c. Petalostylis labicheoides at south base of Table Mountain, Copley. 



D. Shoot habit of Hakea leucoptera, with fruit, from Table Mountain, Copley . 



13, A. Melaleuca glomerata, the "white" tea-tree, in a small branch of Leigh's Creek, Mount 



Series road, Copley. 



B. Melaleuca parviflora, the "black" tea-tree, near Myrtle Springs road, Copley, 

 c. Eucalyptus rostrata, the red gum, on Leigh's Creek, Copley. 



14, A. Eremophila alternifolia at side of small wash near Mount of Light, Copley. 

 B. Eremophila longifolia on edge of Copley Plain near Leigh's Creek, Copley. 



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