316 ERICACEAE 



Leaves narrowly to broadly elliptic, rounded or acutish at apex, 2.5-6 cm. long, bright green, 

 thick, glabrous ; panicle ample, the branches puberulent ; bracts triangular, 3 mm. long ; pedicels 

 glabrous; corolla 7-8 mm. long, white; fruit depressed-globose, viscid with a short glandular 

 puberulence, about 10-12 mm. broad, the pulp very thin or none; stones irregularly separable. 



Mountain slopes, Upper Sonoran and Arid Transition Zones; Inner Coast Ranges, Lake and Napa 

 Counties, California. Type locality: "covering the undulating obsidian slopes south of Uncle Sam Mountain, 

 Lake County, California. March-May. 



15. Arctostaphylos Manzanita Parry. Common Manzanita. Fig. 3708. 



Arclostaphytos Manzanita Parry, Bull. Calif. Acad. 2: 491. 1887. 

 Uva-tirsi Manzanita Heller, Muhlenbergia 9: 68. 1913. 



An erect bushy or arborescent shrub, 2-4 m. high, with smooth dark red-brown bark and 

 puberulent or nearly glabrous branchlets. Leaves ovate to suborbicular or broadly obovate, 

 2.5-4.5 cm. long, obtuse or rounded, mucronate, dull green with a bloom, sparingly puberulent 

 when young, becoming glabrous, firm-coriaceous ; flowers in more or less ample panicles, rachis 

 hoary-tomentose to nearly glabrous ; flowers 7-8 mm. long, pale pink or white ; ovary glabrous ; 

 fruit slightly depressed-globose, 8-12 mm. broad ; nutlets irregularly coalescent, carinate on the 

 back and rugose. 



Mountain slopes and hillsides, Upper Sonoran Zone; North Coast Ranges and western slopes of the 

 northern Sierra Nevada, California. Type locality: "lower foothills of the Coast Ranges north of San Fran- 

 cisco." Jan.-March. 



16. Arctostaphylos pungens H. B. K. Mexican Manzanita. Fig. 3709. 



Arctostaphylos pungens H. B. K. Nov. Gen. & Sp. 3: 278. 1819. 

 Daphnidostaphylis pungens Klotzsch, Linnaea 24:80. 1851. 

 Arctostaphylos montana Eastw. Proc. Calif. Acad. III. 1: 83. 1897. 

 Uva-ursi pungens Abrams, Bull. N.Y. Bot. Card. 6: 432. 1910. 



An erect shrub, branching from the base, with smooth red-brown bark, the branchlets more or 

 less cinereous with a fine tomentum. Leaves ovate to broadly lanceolate, or obovate to ob- 

 lanceolate, 1.5-3 cm. long, cinereous-tomentulose when young, becoming glabrous and dull 

 green or somewhat shining in age; racemes short, spike-like, simple or with 1 or 2 short 

 branches ; bracts triangular, 3 mm. long, tomentose throughout ; pedicels 5-7 mm. long, glabrous ; 

 corolla 7 mm. long; ovary glabrous; fruit depressed-globose, 5-8 mm. broad, chestnut-brown; 

 nutlets separable or irregularly coalescent, carinate and prominently corrugately roughened. 



Mountain slopes, Upper Sonoran Zone; Marin and San Benito Counties, California, south in scattered 

 localities to the mountains of southern California; also in Utah, southward through the Mexican Plateau 

 region to the mountains of Oaxaca. Type locality: on mountain slopes near the city of Mexico. l-eb.-March. 



17. Arctostaphylos rudis Jeps. & Wiesl. Shagbark Manzanita. Fig. 3710. 



Arctostaphylos rudis Jeps. & Wiesl. ex. Jepson, Erythea 8: 100. 1938. 



Shrub 7-15 dm. high, branching from the usually enlarged burl-like base, bark persistent 

 and shreddy, young branchlets viscid-tomentulose. Leaves plane, bright green and glabrous, el- 

 liptic, or a few slightly ovate or even obovate, 2-3 cm. long, rounded or acutish at apex, rounded 

 or obtuse at base ; petioles 4-5 mm. long, tomentulose ; inflorescence short, with 1-2 short ra- 

 cemes with slightly thickened rachis; bracts triangular-lanceolate, shorter than the glabrous 

 fruiting pedicels; corolla pinkish, 6-7 mm. long; ovary glabrous; fruit slightly depressed- 

 globose, reddish brown, about 7 mm. broad. 



Sandy soil. Upper Sonoran Zone; near the coast from Oceano, San Luis Obispo County to near Lompoc, 

 Santa Barbara County, California. Type locality: Corralillos Canyon, Santa Barbara County, California. 

 Nov.-Feb. 



18. Arctostaphylos mewukka Merriam. Indian Manzanita. Fig. 3711. 



Arctostaphylos mewukka Merriam, Proc. Biol. Soc. Wash. 31: 101. 1918. 

 Arctostaphylos pastillosa Jepson, Madrono 1: 83, 93. 1922. 



Arborescent shrub, 1.5-2 m. high, with smooth polished branches and glabrous twigs. 

 Leaves pale grayish green, elliptic to elliptic-ovate, 2.5-5 cm. long, glabrous; racemes panicu- 

 lately branched or rarely simple; bracts triangular-subulate, 4-5 mm. long; pedicels glabrous; 

 sepals smooth on the margins; corolla 6-7 mm. long, white or pink; fruit depressed-globose, 

 smooth, dark brown, 12-15 mm. broad; nutlets irregularly separable. 



Open pine forests and chaparral slopes, Arid Transition Zone; western slopes of the Sierra Nevada, 

 Butte County to Tulare County, California. Type locality: three miles above Colfax on rid^e between. North 

 Fork, American River, and Bear River. Feb.-April. According to Dr. C. H. Merriam, the Mu-wa Indians of 

 Yosemite call this species M%ik-ko." 



19. Arctostaphylos insularis Greene. Island Manzanita. Fig. 3712. 



Arctostaphylos insularis Greene ex. Parry, Bull. Calif. Acad. 2: 494. 1887. 

 Uva-ursi insularis Heller, Muhlenbergia 9: 68. 1913. 



A symmetrically much-branched shrub, 1-2 m. high, root crowm not enlarged and not sprout- 

 ing after fire; bark smooth, red-brown, young branchlets pale green, glabrous. Leaves ovate, 

 mostly 3-4 cm. long, narrowed at base to the petioles, glabrous, bright green and shining on 

 both surfaces, stomata only on the lower edge; flowers in open panicles; rachis puberulent; 

 bracts short and triangular or those near the base f oliaceous, glabrous ; pedicels glandular-hairy ; 



