CLEMENTS 



Petran Chaparral 



PLATE 4t 



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A. Quercu^-Rhtis-Cercocarpus association, Manitou, Colonido. 



B. Detail of same, Qturnm and Rhus in foroRround, Circocarpus behind, Manitou, Colorado. 



C. Circffcarpus pamfoliiui consoi.iation, Chugwater, Wyoming. 



