664 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



2. Arctostaphylos pringlei Parry, Calif. Acad. Sci. Bui. 2: 494. 



1887. 



Southern Coconino County and * Hualpai Mountain (Mohave 

 County) to the Pinaleno Mountains (Graham County) and the Rin- 

 con and Santa Catalina Mountains (Pima County), 4,000 to 6,500 

 feet, common on dry slopes, often with cypress, juniper, and pinyon, 

 April to June. Arizona, southern California, and Baja California. 



A large shrub, often 2 m. (6 feet) high. 



3. Arctostaphylos pungens H. B. K., Nov. Gen. et Sp. 3: 278. 1818. 

 Apache County to Coconino County, south to Cochise, Santa Cruz, 



and Pima Counties, 4,000 to 8,000 feet, abundant on dry slopes, often 

 accompanied by A. pringlei, March and April. New Mexico, southern 

 Utah, Arizona, southern California, and Mexico. 



Pointleaf manzanita. A smaller shrub than A. pringlei, with a more 

 pronounced tendency to form dense thickets, these often nearly 

 impenetrable because of the rigid, crooked stems. Exceptionally 

 broad-leaved specimens, e. g., a collection at the Grand Canyon (Tide- 

 strom 2350), resemble the next species except in the absence of glan- 

 dular pubescence. 



4. Arctostaphylos patula Greene, Pittonia 2: 171. 1891. 



Arctostaphylos pungens var. platyphylla A. Gray, Syn. Fl. 2 1 : 



28. 1878. 

 Arctostaphylos platyphylla Kuntze, Rev. Gen. PL 2: 385. 1891. 



Navajo Mountain and north rim of the Grand Canyon (Coconino 

 County), 7,000 to 8,500 feet, coniferous forests, May and June. 

 Colorado to northern Arizona and California. 



Greenleaf manzanita. In Arizona a low shrub, commonly not more 

 than 1 m. (3 feet) high, thicket-forming, the stems rooting where they 

 touch the soil. Reported to be very resistant to fire. The foliage is 

 brighter green than in the other species. 



8. VACCINIUM. Blueberry, whortleberry 



The Arizona species a low shrub, less than 0.5 m. high; twigs yellow- 

 ish or tinged with red, acutely angled; leaf blades ovate, oval, oblan- 

 ceolate, or obovate, distinctly serrulate, rounded to acutish at apex, 

 1 to 3 cm. long; corolla about 4 mm. long; fruit black purple, not glau- 

 cous, up to 8 mm. in diameter, juicy. 



1. Vaccinium oreophilum Rydb., Torrey Bot. Club Bui. 33: 148. 

 1906. 



White Mountains (Apache County), Pinaleno Mountains (Graham 

 County), Santa Catalina Mountains (Pima County), 9,000 to 11,000 

 feet, July. Canada to New Mexico and Arizona. 



This plant is closely related to V.membranaceum Dough, a common 

 species of the northwestern United States and British Columbia, but 

 is smaller in all its parts. On Baldy Peak above 9,000 feet it is an 

 important element of the ground cover in spruce forests. 



95. PRIMULACEAE. Primrose family 



Plants herbaceous, annual or perennial, scapose or with leafy stems; 

 leaves simple, entire or shallowly dentate; inflorescence various; 



