202 BOTANICAL GAZETTE [SEPTEMBER 
the widest distribution, while those with the specialized types are 
confined to peculiar habitats. 
Gutierrezia Sarothrae, which has a generalized root system, is 
very widely distributed in primitive growths and as a ruderal. 
A number of species are confined here to the sides of arroyo beds 
and are characterized by prominent tap roots. Lycium pallidum 
has prominent horizontal roots and is confined almost entirely to 
rapidly eroding banks. 
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_ the most fleshy roots grow in situpiions s better watered than the 
average. Cucurbita foetidissima grows near irrigation ditches and 
_ along arroyos; -Rumex hymenosepalus occurs in the broad arroyoS 
a ‘crossing the mesa; Berlandiera i is esas almost entirely to the i 
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