591 



corrugata, in open association ; while Uldinia mercvrialis, 

 Lappula corvcava, Calotis hispidula, and Daucus glochidiatus 

 formed j^atches often in association with one another. Also 

 on the flats, Velleia paradoxa was found associated with the 

 annual plant Brachycome ciliaris. 



2. OOLDEA SOAK. 



At Ooldea Soak, where a wonderful supply of fresh water 

 is obtainable at a shallow depth, some of the vegetation is 

 luxuriant; for instance, Myriocephalvj< Stiiartii formed a 

 veritable carpet where it grew in the hollows near the wells. 

 Associated with this plant was Senecio Gregorii and large 

 shrubs of Leptospermum laevigatum, var. minus (pi. xxxix., 

 fig. 2), although I also noted the latter species some miles 

 from the Soak growing on a sand ridge. In the hollow, 

 where the wells are situated, was found the "water-bush, 

 Adriaiia Hooheri, and ascending the sandhills, to the west, 

 Melaleuca parvi-ficyra and Acacia ligidata were met with, 

 while Gyrostemon ramidosus was only seen on the ridges. 



3. BARTON DISTRICT. 



Barton is situated in the centre of the sandhill tract and 

 is similar country to Ooldea. Its flora, too, is similar, only 

 slight differences being noted. Twenty-six of the species noted 

 here were not recorded from Ooldea, while 67 species col- 

 lected at the latter place were not seen at Barton. Tlie type 

 of plants was the same as at Ooldea, Casu-arina lepidophloia, 

 however, was more plentiful, although it could hardly be said 

 to dominate the flora. There was the visuBlAcacia-Eucalyptiis 

 association with Acacia ramulosa and Eucalyptus oleosa, as 

 the dominants, particularly the former. The former species 

 was met with almost everywhere (sometimes in a semi-closed 

 formation), while the latter was reduced to a clump, here and 

 there. Although the season (1920) had been a good one 

 hardly a seedling was seen of either of these species. An 

 occasional clump of E. transcontinentalis was seen, while a 

 clump of mallee (Eucalyptus oleosa, pi. xli., fig. 1), remark- 

 able for its prostrate trunks, covered a patch about 10 yards 

 across, situated in a hollow between the usual sand ridges. 

 Only two or three of the trunks were upright and were about 

 3 m. high; the others were lying on the ground, right from 

 their base. The middle of the trunk was somewhat arched 

 and the branches were horizontal. The aphyllous shrub, 

 Bossiaea Walkeri, seemed to prefer the lower situations and 

 often formed large thickets. The flattened stems exude quite 

 a quantity of smooth white powder while drying. Dodonaea 

 microzygO' was not plentiful, nor was Olearia suhspicata, and 



