MISC. PUBLICATION 42 3, TJ. S. DEPT. OF AGRICULTURE 



lished monographs and revisions that have been consulted in prepar- 

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 desire further information on the groups in question. As a rule, 



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z' It' 







Figure 1. — Sketch map of Arizona, showing the boundaries of the counties, the 

 principal rivers, and some of the more important towns. 



comprehensive and generally accessible works such as the Synoptical 

 Flora of North America, North American Flora, and Das Pflanzenreich 

 are not included in these references; nor has it seemed necessary to 

 cite floras of neighboring States and of Mexico, although, of course, 

 these works have been consulted freely. 



