82 



American Midland Naturalist Monograph No. 4 



into 4 sections from the top; seeds numerous. (Syns. P. californicus Benth., 

 P. Gordonianus Lindl. 



Occurrence. — OLYMPIC: Lake Crescent; Elwha River. MOUNT RAINIER, in moist 

 open woods. CRATER LAKE, rare: southwest corner of the park. YOSEMITE, common 

 along streams, 2,200 to 5,000 feet: El Portal checking station; near Sentinel Hotel; 

 Awahnee Hotel; Bridalveil Falls; \'osemite Falls; Coulterville road; Hetch Hetchy 

 Valley, sequoia: Colony Mill road; South Fork Kaweah River; 1 mile east of Hos- 

 pital Rock. GLACIER, occasional, 4,500 to 5,500 feet: Going-to-the-Sun Highway 1 

 mile below Going-to-the-Sun Chalet; Otokomi Lake trail; highway northwest of Logan 

 Pass; Nyack Valley above first snowshoe cabin. 



2. Littleleaf Mock-orange (Phtladelphus microphyllus Gray). — 

 Spreading, stifHy-branched shrub 3 to 6 feet high; leaves opposite, 1/2 to 1 inch 

 long, oblong to egg-shaped, pointed at the tips, thinly to densely hairy, espe- 

 cially below; flowers 1 to 3 at the ends of the branchlets; petals 4, white, 

 about 1/3 to Yz inch long; fruit a woody capsule about ^ to % inch long, 

 splitting into 4 sections from the top; seeds numerous. 



There is a great deal of variation in the hairiness of the leaves which 

 has given rise to several named forms, but other distinctions are very slight. 

 (Syns. P. argyrocalyx Woot., P. occidentalis Nels., P. argenteus Rydb., P. 

 serpyllijolius Gray, as listed from our areas.) 



Occurrence. — mesa VERDE, rare: 6,000 to 6,600 feel: Navajo Canyon below Spruce 

 Canyon; Spruce Canyon below park headquarters. ZION, occasional, about 5,000 feet: 

 above Weeping Rock on trail to east rim; Zion Arch trail. GRAND CANYON, 6,000 to 

 8,800 feet. North Rim, common near edge of rim: Cape Royal; Point Imperial; Bright 

 Angel Point. South Rim, occasional just below rim: Bass Camp. Canyon, occasional: 



Fig. 30. Lewis mock-orange (Phtladelphus Fig. 31. Fendlera (Fendlera rupicola). 

 Lewisi). 



