312 ERICACEAE 



lar, 12-20 mm. long. Mount Tamalpais and Bolinas Ridge, Marin County, and Santa Cruz Mountains, Santa 

 Cruz County, California. Type locality: Mount Tamalpais. 



2. Arctostaphylos myrtifolia Parry. lone or Myrtle-leaved Manzanita. 



Fig. 3695. 



Arctostaphylos myrtifolia Parry, Pittonia 1: 34. 1S87. 

 Uva-ursi myrtifolia Abrams, N. Amer. Fl. 29: 100. 1914. 

 Arctostaphylos nummularia var. myrtifolia Jepson, Madrofio 1 : 85. 1922. 

 Hchizococcus myrtifolius Eastw. Leaflets West. Bot. 1 : 99. 1934. 



Low diffusely branching shrub with decumbent or ascending branches, the branchlets glan- 

 dular-puberulent and setose-hispid with rather short, stiff hairs. Leaves ovate to narrowly el- 

 liptic, 5-18 mm. long, obtuse at base, acute and prominently cuspidate at apex, firm-coriaceous, 

 glossy green on both surfaces, glabrous or sparingly short-pubescent, especially toward the base ; 

 raceme very short, simple or few-branched; rachis glandular-puberulent, bracts triangular; 

 pedicels glabrous ; calyx-lobes ciliate on the margins ; corolla 4 mm. long ; ovary covered with 

 short stiff hairs ; fruit smooth, small ; nutlets 3 or 4, scarcely 2 mm. long. 



Dry rocky ridges, Upper Sonoran Zone; foothills of the Sierra Nevada, Amador County, California. 

 Type locality: near lone, California. Jan.-Feb. 



3, Arctostaphylos nissenana Merriam. Eldorado Manzanita. Fig. 3696. 



Arctostaphylos nissenana Merriam, Proc. Biol. Soc. Wash. 31: 102. pi. 4, 5. 1918. 

 Schisococcus nisscnanus Eastw. Leaflets West. Bot. 2: 49. 1937. 

 Arctostaphylos nissenana var. arcana Jepson, Fl. Calif. 3: 39. 1939. 



Erect shrub, 1-2 m. high with reddish brown fibrous bark and slender, villous-hirsute 

 branchlets. Leaves oblong to elliptic or some oblong-obovate. 12-20 mm. long, 5-10 mm. wide, 

 acute or obtuse and mucronate at apex, obtuse at base, pale green, puberulent when young, 

 mostly glabrate in age ; petioles villous-pubescent, the pubescence usually extending a short dis- 

 tance up the midrib and the margins of the blade ; racemes short, about 1 cm. long ; lower floral 

 bracts foliaceous, villous, the upper reduced, reddish, scarcely equaling the glabrous pedicels ; 

 corolla pink, barely 5 mm. long; ovary pubescent; fruit oblong or oblong-obovoid, thinly pilose 

 or glabrate, the exocarp thin ; nutlets usually 5, separating soon after maturity. 



Rocky ridges, Upper Sonoran and lower border of And Transition Zones; western slopes of the Sierra 



Nevada in the vicinity of Placerville, Eldorado County, California. Type locality: Eldorado County. "Collected 



2 or 3 miles north of Louisville, Eldorado County, Calif. (SW of American Flat and near top of a low ndge, 

 alt. 2,300-2,400 ft.)." Jan.-March. 



4. Arctostaphylos Uva-ursi (L.) Spreng. Red Bearberry or Kinnikinnick. 



Fig. 3697. 



Arbutus Uva-ursi L. Sp. PI. 395. 1753. 



Arctostaphylos Uva-ursi Spreng. Syst. 2: 287. 1825. 



Uva-ursi procumbens Moench, Meth. 470. 1794. 



Uva-ursi Uva-ursi Britt. in Britt. & Brown, 111. Fl. ed. 2. 2: 693. 1913. 



Prostrate shrub with rooting branches 2-5 dm. long, tardily exfoliating red-brown bark 

 and glabrous or sparsely tomentulose branchlets. Leaves spatulate to obovate, 1.5-2 cm. long, 

 rounded or emarginate at apex, not at all mucronate, thin-coriaceous, bright green and glabroiis 

 above, paler beneath; petioles 2-3 mm. long; flowers in short, few-flowered racemes; rachis 

 sparsely tomentose ; bracts triangular, 2 mm. long, persistent ; pedicels 3-4 mm. long, glabrous ; 

 corolla 4-6 mm. long, white or tinged with pink ; ovary glabrous ; fruit bright red, with a bitter 

 astringent pulp ; nutlets separable. 



Of various habitats, ranging from seashore sand dunes to alpine slopes above timber line. Transition and 

 Boreal Zones; Arctic America south to Virginia, Illinois, New Mexico, and California; also Eurasia. In the 

 Pacific States it is common in both western and eastern Washington, western Oregon and the Blue Mountains, 

 but in California it is found only along the northern coast to Marin County. Type locality: northern Europe. 

 March-June. Sandberry. 



Arctostaphylos media Greene, Pittonia 2: 171. 1891. Low shrub, the main branches procumbent. Leaves 

 obovate-cuneiform, 2-3 cm. long, puberulent beneath; racemes short, few-flowered; pedicels glabrous; fruit 

 slightly depressed; nutlets consolidated. In all probability this is a hybrid between A. Uva-ursx and A. colum- 

 biana. It is found associated with these two species in western Washington. Type locality: dry gravelly 

 ground, Mason County, Washington. 



Other hybrids arising from A. Uva-ursi and other local forms have been reported as occurring on the 

 northern California coast by J. E. Adams. (Journ. E. Mitchell Sci. Soc. 56: 16. 1940.) 



5. Arctostaphylos nevadensis A. Gray. Pinemat Manzanita. Fig. 3698. 



Arctostaphylos nevadensis A. Gray, Syn. Fl. N. Amer. 2^: 27. 1878. 

 Uva-ursi nevadensis Abrams, N. Amer. Fl. 29: 94. 1914. 



Depressed shrub with decumbent branches 3-6 dm. long, forming mats, old branches polished 

 red-brown, young twigs more or less tomentose. Leaves ovate to oblanceolate, commonly nar- 

 rowly obovate, 1.5-2.5 cm. long, rounded to acutish and prominently mucronate at the apex, 

 bright green on both surfaces, glabrous or somewhat puberulent; flowers in short simple or 

 few-branched racemes; bracts abruptly acuminate above the base, 3 mm. long; pedicels gla- 

 brous; flowers usually white; corolla 7-8 mm. long; ovary glabrous; fruit depressed-globose, 

 with copious acid pulp ; nutlets separable, rugose. 



Rocky mountain slopes, mainly Canadian Zone; Cascade Mountains, Washington, south to the Sierra 

 Nevada, California. Type locality: Sierra Nevada, California, at elevations of 8,000 to 10,000 ft. June. 



