HEATH FAMILY 311 



Bark exfoliating, leaving a smooth polished red-brown surface. 



Young branches tomentose or glandular-pubescent, but without long bristly 

 hairs or rarely with a few scattering ones. 

 Branchlets not glandular-pubescent; inflorescence not glandular. 



Leaves green, only thinly tomentulose ; fruiting pedicels not re- 

 curved. 

 Bracts lanceolate, the upper reduced and shorter than the pedi- 

 cels; leaves 2-3.5 cm. long. 24. A. cincrca. 

 Bracts mostly foliaceous, the upper longer than the pedicels; 

 leaves mostly 3-5 cm. long. 29. A. Tracyi. 

 Leaves gray-green and more or less densely white-tomentulose on 

 both sides; fruiting pedicels recurved-spreading. 

 Ovary densely pubescent; leaves, branchlets and inflorescence 

 more or less densely white-tomentulose. 



25. A. canescens. 



Ovary glabrous or nearly so. 



Leaves obtuse or rounded at base. 



26. A. stlvxcola. 



Leaves truncate or cordate at base. 



27. A. obispoensis. 



Branchlets and the inflorescence glandular-pubescent. 



Leaves elliptic to oblong, l.S-3.5 cm. long. 



28. A. otayensis. 



Leaves narrowly ovate to lanceolate, 3.5-6.5 cm. long. 



30. A. virgata. 



Young branches with long bristly hairs as well as shorter pubescence. 



Ovary densely pubescent; fruit not striped. 



Pubescence of branches glandular. 30. A. virgata. 



Pubescence not glandular. 31. /I. columbiana. 



Ovary usually glabrous; fruit usually with blue-black stripes. 



32. A. pilosula. 



Leaves sessile or nearly so, cordate or auriculate-clasping at base. 

 Bark exfoliating, leaving a smooth red-brown surface. 

 Pedicels and ovaries pubescent or glandular-hairy. 



Branchlets and inflorescence glandular-villous, rarely glabrate. _ 



33. A. AndcrsoMX. 



Branchlets and inflorescence tomentose and sparsely setose-bristly, not 

 glandular. 34. A. auriculata. 



Pedicels and ovaries glabrous or essentially so. 36. A. pechoensis. 

 Bark on old stems shreddy; branches dense forming a compact crown. _ 



35. A. pajaroensts. 



Plants stump-sprouting from an enlarged burl, not fire-killed. 



Leaves dull or gray-green, more or less pubescent and about equally stomatiferous on 

 both sides. 

 Fruit glandular-pubescent; stems several from a much-enlarged burl-like root 



^.I-uwIl. -57. A. glandulosa. 



Fruit not glandular; low intricately branched shrub. 38. A. intricata. 

 Leaves darker green, usually shining and with few or no .stomata on the upper 

 side, often subcordate at base. 

 Bark smooth, exfoliating, leaving a smooth red-brown trunk. 



Branchlets more or less tomentose and villous-hirsute, not glandular; leaves 

 firm, tomentose beneath or glabrate on both sides. 



39. A. Crustacea. 



Branchlets and inflorescence glandular-pubescent or -villous. 



40. A. subcordata. 



Bark more or less persistent and shreddy. 



Young branches and inflorescence glandular-villous; pedicels glandular- 

 villous. 41. A. bractcosa. 

 Young branches and inflorescence densely tomentose; pedicels villous, not 

 glandular. 42. A. totnentosa. 

 Pericarp with no granular pulp; fruit large, 12-15 mm. long; nutlets coalesced into a large stone; 

 arborescent shrub with glaucous and normally glabrous foliage. 43. A. giattca. 



1. Arctostaphylos Nummularia A. Gray. Fort Bragg Manzanita. Fig. 3694. 



Arctostaphylos Numrmdaria A. Gray, Proc. Amer. Acad. 7: 356. 1868. 

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

 Schicococcus Nummularius Eastw. Leaflets West. Bot. 1 : 99. 1934. 

 Schizococcus Nummularius var. latifolius Eastw. op. cit. 2: 50. 1937. 



Low shrub, seldom over 3-4 dm. high, the branches numerous, mostly prostrate, bark ex- 

 foHating becoming smooth and red-brown, branchlets pilose-pubescent. Leaves numerous, el- 

 liptic to oblong, or sometimes ovate, 8-15 mm. long, usually subcordate at base, glossy green on 

 both surfaces, glabrous except for pilose hairs on the base of the midvem and the short petiole ; 

 flowers in short racemes; bracts triangular, glabrous; pedicels slender, glabrous; flowers 4- 

 merous; calyx-lobes ovate, ciliate on the margins, otherwise glabrous; corolla 4-5 mm. long; 

 ovary densely pubescent; fruit oblong, flattened laterally, 4-6 mm. long, dark brown; nutlets 

 nearly or quite smooth, readily separable, thin-walled. 



Barren sandy or rocky slopes. Humid Transition Zone; coastal region of Mendocino and Sonoma Counties, 

 California. Type locality: on the plains near Mendocino City, California. March-April. Glossy-leaved Man- 

 zanita. 



Arctostaphylos Nummularia var. sensitiva (Jepson) McMinn, 111. Man. Calif. Shrubs 389 1939. 

 (A. sensitiva Jepson, Madrofio 1: 85. 1923.) Erect shrub 6-15 dm. high. Leaves broadly elliptic to suborbicu- 



