SHREVE 



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 hoopcsii. 



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. 



