Arctostaphylos auriculata |
Arctostaphylos pacifica |
|
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Mount Diablo manzanita, Mt. Diablo manzanita |
Pacific manzanita |
|
Habit | Shrubs, erect, 1–4.5 m; burl absent; twigs densely white-hairy with long, white hairs. | Shrubs, prostrate or mound-forming, 0.1–0.3 m; burl present, sometimes epicormic; twigs short-hairy. |
Leaves | petiole to 2 mm; blade whitish gray, dull, oblong-ovate to orbiculate-ovate, 1.5–4.5 × 1.5–3 cm, base distinctly lobed, auriculate-clasping, margins entire, plane, surfaces smooth, gray-canescent, glabrescent. |
petiole 2–4 mm; blade light green abaxially, dark green adaxially, shiny, elliptic, 1–2 × 0.5–1 cm, base cuneate, margins serrulate, plane, surfaces smooth, sparsely hairy. |
Inflorescences | panicles, 3–5-branched; immature inflorescence pendent, (branches crowded, ± obscured by bracts), axis 1–1.5 cm, 1+ mm diam., densely white-hairy with long, white hairs; bracts somewhat appressed, leaflike, ovate to lanceolate-ovate, 5–15 mm, apex acute, surfaces canescent. |
racemes, (simple or 1-branched); immature inflorescence pendent, (congested), axis 0.5–1 cm, 1+ mm diam., short-hairy; bracts appressed, scalelike, awl-like, 0.5–1 mm, apex acute, glabrous. |
Pedicels | 4–10 mm, tomentose. |
3–5 mm, glabrous. |
Flowers | corolla white to pink, conic; ovary densely white-hairy. |
corolla white, urceolate; ovary glabrous. |
Fruits | depressed-globose, 5–10 mm diam., short white-hairy, glabrescent. |
(reddish), globose, 6–8 mm diam., glabrous. |
Stones | distinct. |
distinct. |
2n | = 26. |
|
Arctostaphylos auriculata |
Arctostaphylos pacifica |
|
Phenology | Flowering winter–early spring. | Flowering winter–early spring. |
Habitat | Chaparral, open, closed-cone conifer forests | Sandstone outcrops |
Elevation | 300-500 m (1000-1600 ft) | 300 m (1000 ft) |
Distribution |
CA |
CA
|
Discussion | Of conservation concern. Arctostaphylos auriculata is found on the western slopes of Mount Diablo in Contra Costa County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. A distinctive species with an uncertain origin, Arctostaphylos pacifica has often been relegated to hybrid status and ignored; it displays a number of unique characters not found in any other species. It is found only at one location, San Bruno Mountain, the northern part of the Santa Cruz Mountains, San Mateo County. The relationships of this species need additional study. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 430. | FNA vol. 8, p. 415. |
Parent taxa | Ericaceae > subfam. Arbutoideae > Arctostaphylos | Ericaceae > subfam. Arbutoideae > Arctostaphylos |
Sibling taxa | ||
Name authority | Eastwood: Bull. Torrey Bot. Club 32: 202. 1905 , | Roof: Leafl. W. Bot. 9: 217. 1962 , |
Web links |