Arctostaphylos sensitiva |
Arctostaphylos columbiana |
|
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coinleaf manzanita, dwarf manzanita, glossyleaf manzanita |
bristly manzanita, Columbia manzanita, hairy manzanita, redwood manzanita |
|
Habit | Shrubs, erect or mound-forming, 1–2 m; burl absent; bark on older stems red, smooth; twigs densely short-haired with longer gland-tipped hairs. | Shrubs or trees, erect, 2–5 m; burl absent; twigs densely short-hairy, usually with long, white hairs, often glandular. |
Leaves | bifacial in stomatal distribution; petiole 1–3 mm; blade light green abaxially, dark green adaxially, shiny, orbiculate to orbiculate-ovate, 1–2.2 × 0.8–1.8 cm, base truncate to ± lobed, margins entire, cupped, surfaces smooth, glabrous, midvein hairy. |
petiole 4–10 mm; blade dark green, dull, lanceolate-ovate to narrowly oblong-ovate, 4–6 × 2–3 cm, base cuneate to ± rounded, margins entire, plane, surfaces ± papillate, finely scabrous, finely hairy, sparsely glandular-hairy. |
Inflorescences | panicles, 4–8-branched; immature inflorescence pendent, branches spreading, axis 0.5–1 cm, to 1 mm diam., densely short-hairy with longer gland-tipped hairs; bracts appressed, scalelike, deltate, 0.5–2 mm, apex acute, surfaces glabrous. |
panicles, 3–8-branched; immature inflorescence pendent, branches ± spreading, axis 1.5–2.5 cm, 1+ mm diam., densely short-hairy, usually with long, white hairs, sometimes glandular; bracts not appressed, (green), leaflike, oblong-lanceolate, 10–18 mm, apex acuminate, surfaces finely glandular-hairy. |
Pedicels | 3–5 mm, glabrous. |
2–4 mm, finely glandular-hairy. |
Flowers | 4-merous; corolla white to pink, urceolate; ovary white-hairy. |
corolla white, conic to urceolate; ovary densely white-hairy, sometimes sparsely glandular. |
Fruits | subcylindric, 3–4 mm diam., glabrous. |
depressed-globose, 8–11 mm diam., sparsely hairy. |
Stones | distinct (breaking apart in mature fruit). |
distinct. |
2n | = 26. |
= 26. |
Arctostaphylos sensitiva |
Arctostaphylos columbiana |
|
Phenology | Flowering winter–early spring. | Flowering winter–early spring. |
Habitat | Sandstone uplands in maritime chaparral or closed-cone conifer forests near coast | Chaparral, gaps and margins of conifer forests along coast, sometimes extending inland, open areas around rock outcrops |
Elevation | 100-600 m (300-2000 ft) | 0-1000(-1400) m (0-3300(-4600) ft) |
Distribution |
CA
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CA; OR; WA; BC
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Discussion | Of conservation concern. Arctostaphylos sensitiva occurs in Marin, San Mateo, and Santa Cruz counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Arctostaphylos columbiana is widespread near the coast from northern California to southern British Columbia; it extends inland along the Columbia River Gorge in Oregon and Washington, and inland in Oregon to the western base of the Cascades. Some variation in twig indument occurs in the prominence of longer, stiff hairs, and in the degree of glandulosity. Some plants along the immediate coast of northern California into Oregon lack the longer hairs and have been distinguished as var. tracyi. Hybrids with A. uva-ursi are low shrubs (0.5–1 m) with intermediate vegetative characters. Referred to as A. ×media Piper, these hybrids have been reported from British Columbia, California, Oregon, and Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 418. | FNA vol. 8, p. 425. |
Parent taxa | Ericaceae > subfam. Arbutoideae > Arctostaphylos | Ericaceae > subfam. Arbutoideae > Arctostaphylos |
Sibling taxa | ||
Synonyms | A. nummularia subsp. sensitiva, A. nummularia var. sensitiva | A. columbiana var. tracyi, A. tracyi |
Name authority | Jepson: Madroño 1: 85. 1922 , | Piper: in C. V. Piper and R. K. Beattie, Fl. N.W. Coast, 279. 1915 , |
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