RELATION OF LEAF STRUCTURE TO PHYSICAL FACTORS 97 



Plate VII 



Fig. I. Primula parryi. 



a. Alpine rock cleft. 



b. Sunny brook bank. 

 Fig. 2. Mertensia polyphylla, 



a. Sunny brook bank. 



b. Alpine meadow. 



Fig. 3. Aconitum columbianum. 



a. Sunny brook bank. 



b. Shady brook bank. 



Fig. 4. Quercus novimexicana, gravelly brook bank. 



a. Sun-leaf. 



b. Shade-leaf. 



Fig. 5. Viburnum pauciflorum. 



a. Sunny brook bank. 



b. Thicket. 



Fig. 6. Blitum capitatum. 



a. Half gravel. 



b. Subalpine thicket. 



Plate VIII 



Fig. I. Galium boreale. 



a. Subalpine gravel. 



b. Subalpine spruce forest. 

 Fig. 2. Polygonum convolvulus, 



a. Foothill gravel. 



b. Shady brook bank. 

 Fig. 3. Bidens bigelovii. 



a. Foothill half gravel. 



b. Foothill thicket. 

 Fig. 4. Scutellaria brittonii. 



a. Subalpine gravel. 



b. Subalpine thicket. 



Fig. 5. Apocynum androsaemifolium. 



a. Subalpine gravel. 



b. Subalpine thicket. 

 Fig. 6. Artemisia ludoviciana. 



a. Foothill mesa. 



b. Foothill thicket. 



Fig. 7. Monarda menthifolia. 



a. Subalpine half gravel. 



b. Subalpine thicket. 



Fig. 8. Machaeranthera aspera. 



a. Subalpine gravel. 



b. Shady brook bank. 



