AUSTRALIAN SALTBUSH. 



all cultivated fields and along roadsides, and it grows luxuriantly in 

 irrigated alfalfa fields both on the levees or ridges and in the borders 

 or checks throughout the fields. About Tulare it does not do so well 

 as in the Bakersfield- Wasco area. However, it appears in consider- 

 able quantity on the higher ground along fences and on well-raised 

 ridges in irrigated fields. The lands about Tulare are low, poorly 

 drained, and quite wet during the winter. Apparently this wet con- 

 dition is the factor that limited the spread of this saltbush in this area. 



In Arizona the Australian salt- 

 bush is largely confined to the irri- 

 gated areas, where it is found grow- 

 ing along ditch banks, roadsides, 

 and in neglected fields. 



EXPLANATION' 



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Fig. 4. — Outline map of California, showing the distribution of the Australian saltbush. 



The accompanying map shows the present distribution of the 

 Australian saltbush in California, as far as known. (Fig. 4.) 



CLIMATIC REQUIREMENTS. 



The climatological record of various places hi the Australian salt- 

 bush area of California and Arizona is given in Table I. The maxi- 

 mum temperature recorded is 118° F., at Yuma, Ariz. At Bakers- 

 field, Calif., and at Phoenix and Tucson, Ariz., where high tempera- 



