Plate 33 
A. Open Forest on summit of Mount Lemmon, at 9,000 feet, with good reproduction of Pinus arizonica and 
a close stand of Dugaldia hoopesit. 
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B. Mature thicket of Populus tremuloides on summit of Mount Lemmon at 9,100 feet. 
In foreground are 
Pteris aquilina var. pubescens and flowering plants of Frasera speciosa. 
