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form. The proportion of species not represented in the flora of 

 Egypt was even larger. The steep hill-sides bore many leguminous 

 shrubs, such as Acacia alhida, species of the succulent, leafless 

 Coralluma, while another asclepiad, the Leptadenia, was very 

 abundant along the khor. Here also, the tree milk weed, CaZoiropis 

 procera, reached as much as fifteen or twenty feet in height (Fig. 

 5). This tree is truly a weed, its broad, thick leaves being seen 

 all over Egypt. The milky juice exudes in quantity when the 



Fig. 6. Elevated valley in mountains between the Red Sea and Valley of the 

 Nile. Coralluma, Aloe and Leptadenia are abundant. 



tissues are cut, and exercises an intensely burning sensation on the 

 skin — the membrane of the eyes being especially sensitive to its 

 effects, so that it is reputed to destroy the eye, by the natives. 

 Chenopodium murale was encountered along the khor previous 

 experience having been had with this plant as a pioneer on 

 the sterilized beaches of the Salton lake in California. 



