Arctostaphylos imbricata |
Arctostaphylos stanfordiana |
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San Bruno Mountain manzanita |
Stanford's manzanita |
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Habit | Shrubs, prostrate or mat- or mound-forming, 0.1–1 m; burl absent; twigs densely fine-hairy with long, gland-tipped hairs. | Shrubs, erect or prostrate to decumbent, mat- or mound-forming, 0.1–3 m; burl absent; twigs usually glabrous, sometimes sparsely short-hairy, hairs sometimes glandular. | ||||||||
Leaves | petiole to 2 mm; blade light green, dull, orbiculate to orbiculate-ovate, 2.5–4 × 2–3 cm, base auriculate-clasping, margins entire, plane, surfaces papillate, ± scabrous, sparsely glandular-hairy. |
petiole 4–12 mm; blade bright green, shiny or slightly glaucous, elliptic, oblong, or oblanceolate, 3–5 × 1.5–2.5 cm, base cuneate, (not clasping), margins entire, plane, surfaces smooth, glabrous or, rarely, finely glandular-puberulent. |
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Inflorescences | panicles, 3–5-branched; immature inflorescence pendent, (branches densely clustered, ± sessile), axis 0.5–1 cm, 1+ mm diam., densely fine-hairy with long, gland-tipped hairs; bracts appressed, leaflike, ovate, 5–10 mm, apex acute, surfaces glandular-hairy. |
panicles, 3–5-branched; immature inflorescence ascendent, branches wide-spreading, often ascending to erect, axis 2–2.5 cm, to 1 mm diam., usually glabrous, sparsely hairy, or sometimes sparsely glandular-hairy; bracts tightly appressed, scalelike, ovate to deltate, 1–1.5 mm (± equaling buds), apex acuminate, surfaces usually sparsely hairy or sometimes sparsely glandular-hairy; (buds scattered along inflorescence axis, round, appearing as “beads”). |
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Pedicels | 3–5 mm, densely glandular-hairy. |
5–10 mm, glabrous. |
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Flowers | corolla white, urceolate; ovary densely glandular-hairy. |
corolla white to pink, urceolate; ovary glabrous. |
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Fruits | depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid). |
subglobose, 6–8 mm diam., glabrous. |
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Stones | distinct. |
distinct. |
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2n | = 26. |
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Arctostaphylos imbricata |
Arctostaphylos stanfordiana |
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Phenology | Flowering winter–early spring. | |||||||||
Habitat | Maritime chaparral on sandstone outcroppings | |||||||||
Elevation | 100-200 m (300-700 ft) | |||||||||
Distribution |
CA
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CA
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Discussion | Of conservation concern. Arctostaphylos imbricata occurs on San Bruno Mountain in San Mateo County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 8, p. 435. | FNA vol. 8. | ||||||||
Parent taxa | Ericaceae > subfam. Arbutoideae > Arctostaphylos | Ericaceae > subfam. Arbutoideae > Arctostaphylos | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | A. andersonii var. imbricata | |||||||||
Name authority | Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 , | Parry: Bull. Calif. Acad. Sci. 2: 493. 1887 , | ||||||||
Web links |