320 ERICACEAE 



28. Arctostaphylos otayensis Wiesl. & Schr. Otay Manzanita. Fig. 3721. 



Arctostaphyloi otayensis Wiesl. & Schr. Madrono S: 43. fig. 2d. 1939. 



Arctostaphylos glandulosa var. australis J. E. Adams, Journ. E. Mitchell Sci. See. 56: 51. 1940. 



Erect shrub, 1-2.5 m. high, without burl-like base, fire-killed, trunk and older branches dark 

 red-brown, smooth, the young branchlets glandular-pubescent. Leaves elliptic to oblong, 1.5-3.5 

 cm. long, rounded or truncate at base, usually acute at apex, finely tomentulose and microscopi- 

 cally glandular on both sides or glabrate ; petioles 4-7 mm. long ; nascent inflorescence erect or 

 suberect, clustered at the ends of the branches, 1-2 cm. long; bracts foliaceous, lanceolate, 3-15 

 mm. long, glandular-pubescent ; corolla white, 5-7 mm. long ; pedicels glandular-hairy ; ovary 

 glandular-pubescent, sometimes sparsely so ; fruit subglobose, 5-8 mm. broad, light brown, shining, 

 glabrate, microscopically glandular or rarely pubescent ; nutlets with 2-3 coalescent, or rarely 

 with all coalesced into a single stone. 



Mountain slopes, Upper Sonoran Zone; Otay Mountain, the type locality, San Diego County, California. 

 Jan.-March. 



29. Arctostaphylos Tracyi Eastw. Tracy's Manzanita. Fig. 3722. 



Arctostaphylos Trdcyi Eastw. Leaflets West. Bot. 1: 79. 1933. 



Arctostaphylos columbtana var. Tracyi J. E. Adams ex. McMinn, 111. Man. Calif. Shrubs 408. 1939. 



Shrub about 2 m. high, with erect branches ; bark polished, reddish purple ; young branches 

 puberulent without hispid hairs. Leaves ovate to narrowly elliptic, 3-6 cm. long, rather thin, 

 bright green and glabrous, or very sparingly puberulent when young, veiny, obtuse at base; 

 petioles puberulent ; bracts narrowly lanceolate, puberulent or glabrous ; pedicels shorter than 

 the bracts, sparingly pubescent ; corolla white ; ovary densely white-tomentose, not glandular. 



Edges of woods, near the coast, Humid Transition Zone; Del Norte and Humboldt Counties, California. 

 Type locality: Big Lagoon and Patrick's Point, Humboldt County, California. Feb. 



30. Arctostaphylos virgata Eastw. Bolinas Manzanita. Fig. 3723. 



Arctostaphylos virgata Eastw. in Sarg. Trees & Shrubs 1: 203. 1905. 

 Arctostaphylos Columbiana var. virgata McMinn ex. Jepson, Fl. Calif. 3: 49. 1939. 



Shrub, 2-4 dm. high, with erect branches, the branchlets, petioles and inflorescence densely 

 glandular villous-pubescent, rarely with a few setose bristles. Leaves ascending, bright green, 

 thin, oblong to ovate-lanceolate, 4-6 cm. long, acute at apex, obtuse at base; panicle densely 

 flowered ; bracts foliaceous ; pedicels glandular with spreading hairs ; corolla white or tinged 

 with rose ; fruit slightly depressed-globose, viscid. 



Canyon slopes and open woods. Humid Transition Zone; Coast Ranges, Marin County, California. Type 

 locality: Mount Tamalpais and the hills west of Tomales Bay, Marin County. Feb.-April. 



31. Arctostaphylos columbiana Piper. Columbia Manzanita. Fig. 3724. 



Arctostaphylos columbiana Piper in Piper & Beattie, Fl. Northw. Coast 279. 1915. 

 Arctostaphylos sctosissima Eastw. Leaflets West. Bot. 1 : 78. 1933. 



Much branched often arborescent shrub, 1-3 m. high ; root crown not enlarged, and not 

 stump-sprouting after fire ; young branchlets densely cinereous-pubescent and hirsute. Leaves 

 oblong to oblong-ovate, 2-6 cm. long, pale green and tomentose on both sides, becoming gla- 

 brous above in age ; petioles short, tomentose and somewhat hirsute ; panicle rather compact with 

 short branches ; bracts foliaceous ; rachis tomentose ; pedicels pubescent ; corolla white or tinged 

 with pink, 6-7 mm. long ; ovary tomentose ; fruit strongly depressed-globose, 7-10 mm. broad, 

 about half as high, rather light brown. 



Open woods and rocky ridges, Humid Transition Zone; Vancouver Island south, west of the Cascade 

 Mountains, to northwestern California. Type locality: near Union City, Mason County, Washington. March- 

 May. 



32. Arctostaphylos pilosula Jeps. & Wiesl. La Panza Manzanita. Fig. 3725. 



Arctostaphylos pilosula Jeps. & Wiesl. ex Jepson, Erythea 8: 101. 1938. 



Erect shrub, 1-3 m. high, fire-killed, the trunk not forming a burl-like base, trunk and 

 older branches smooth and dark red-brown, young branchlets pubescent and usually with inter- 

 spersed bristly hairs. Leaves 1.5^.5 cm. long, oblong to elliptic or ovate, acutish to rounded at 

 apex and usually distinctly apiculate, rounded to truncate or rarely subcordate at base, pale 

 grayish green, glabrous or sparsely tomentulose on both sides, when young rather densely 

 white-tomentulose ; nascent inflorescence mostly drooping, 10-15 mm. long; bracts foliaceous, 

 lanceolate, 5-15 mm. long, rather densely appressed-pubescent and usually thinly short-hirsute 

 at base ; pedicel glabrous or rarely thinly villous-hirsute ; fruit depressed-globose, 8-10 mm. 

 broad, glabrous, brownish and usually marked with vertical blue-black stripes ; nutlets separat- 

 ing. 



Hillsides and mountain slopes usually associated with other shrubs, Upper Sonoran Zone; La Panza 

 Range, San Luis Obispo County, California. Type locality: American Canyon, La Panza Range. Jan.-March. 



