Arctostaphylos patula |
Arctostaphylos pacifica |
|
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green-leaf manzanita |
Pacific manzanita |
|
Habit | Shrubs, erect or mound-forming, 1–3 m; burl usually absent, sometimes flat, obscure; twigs usually densely short-hairy with golden glands on tips of hairs, rarely short white-hairy and eglandular. | Shrubs, prostrate or mound-forming, 0.1–0.3 m; burl present, sometimes epicormic; twigs short-hairy. |
Leaves | petiole 7–15 mm; blade bright green (lightly gray-green if short-hairy), shiny, widely ovate to orbiculate, 2.5–6 × 1.5–4 cm, base rounded, truncate, or slightly lobed, (not clasping), margins entire, plane, surfaces smooth, glabrous or, rarely, short-hairy. |
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, 2–8-branched; immature inflorescence pendent, branches spreading, axis 1.5–3 cm, 1+ mm diam., hairy with golden glands on tips of hairs or short-hairy and eglandular; bracts appressed with incurved tips, scalelike, deltate, 4–6 mm, apex acuminate, surfaces usually densely tomentose with golden glands on tips of hairs, rarely short white-hairy and eglandular. |
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 | 2–7 mm, glabrous or white-hairy. |
3–5 mm, glabrous. |
Flowers | corolla mostly pink, conic to urceolate; ovary glabrous or white-hairy. |
corolla white, urceolate; ovary glabrous. |
Fruits | depressed-globose, sometimes subglobose, 7–10 mm diam., glabrous. |
(reddish), globose, 6–8 mm diam., glabrous. |
Stones | distinct. |
distinct. |
2n | = 26. |
|
Arctostaphylos patula |
Arctostaphylos pacifica |
|
Phenology | Flowering late spring–early summer. | Flowering winter–early spring. |
Habitat | Mountain chaparral and forests | Sandstone outcrops |
Elevation | 400-3000 m (1300-9800 ft) | 300 m (1000 ft) |
Distribution |
AZ; CA; CO; MT; NV; OR; UT; WA; Mexico (Baja California)
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CA
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Discussion | Arctostaphylos patula is abundant and widespread in western North America as a dominant in montane chaparral, pine forest gaps, and high-elevation arid-steppe and canyon-land environments. Populations throughout western North America are characterized by twigs and inflorescence parts covered with relatively short hairs tipped with golden glands. In the central to northern Sierra Nevada, mixed with the widespread form are individuals that are eglandular and have a cover of relatively short, whitish hairs on the stems and inflorescences. Similarly, throughout most of its range, A. patula is nonsprouting after fire, and in areas characterized by winter snow cover it layers and creates broad, low mounds. In much of California, it typically sprouts after fires from obscure and flattened burls, forming circles of erect sprouts. (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. 416. | FNA vol. 8, p. 415. |
Parent taxa | Ericaceae > subfam. Arbutoideae > Arctostaphylos | Ericaceae > subfam. Arbutoideae > Arctostaphylos |
Sibling taxa | ||
Synonyms | A. acutifolia, A. parryana var. pinetorum, A. patula var. coalescens, A. patula subsp. platyphylla, A. platyphylla | |
Name authority | Greene: Pittonia 2: 171. 1891 , | Roof: Leafl. W. Bot. 9: 217. 1962 , |
Web links |