Arctostaphylos imbricata |
Arctostaphylos insularis |
|
---|---|---|
San Bruno Mountain manzanita |
island manzanita |
|
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, (arborescent), 2–5 m; burl absent; (lower stems reddish with glaucous patches); twigs glabrous, sometimes sparsely short-hairy or sparsely glandular-hairy. |
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. |
bifacial in stomatal distribution; petiole 4–8 mm; blade bright green, lustrous, oblong-elliptic, 2.5–4.5 × 1–3 cm, base rounded, margins entire, ± cupped, surfaces smooth, glabrous. |
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, 5–10-branched; immature inflorescence pendent, branches spreading, ascending, or erect, axis 2–3 cm, 1+ mm diam., glabrous, sometimes sparsely short-hairy or sparsely glandular-hairy, (buds ± spread apart); bracts not appressed, scalelike, deltate, 1.5–3 mm, apex acute, surfaces finely glandular-hairy. |
Pedicels | 3–5 mm, densely glandular-hairy. |
6–9 mm, finely glandular-hairy. |
Flowers | corolla white, urceolate; ovary densely glandular-hairy. |
corolla white, conic to urceolate; ovary glabrous or sparsely glandular-hairy. |
Fruits | depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid). |
depressed-globose, 8–15 mm diam., sparsely hairy or glabrous. |
Stones | distinct. |
distinct. |
2n | = 26. |
= 26. |
Arctostaphylos imbricata |
Arctostaphylos insularis |
|
Phenology | Flowering winter–early spring. | Flowering winter–early spring. |
Habitat | Maritime chaparral on sandstone outcroppings | Island chaparral and woodlands |
Elevation | 100-200 m (300-700 ft) | 200-400 m (700-1300 ft) |
Distribution |
CA
|
CA
|
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.) |
Of conservation concern. Arctostaphylos insularis is known from Santa Cruz Island. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 435. | FNA vol. 8, p. 422. |
Parent taxa | Ericaceae > subfam. Arbutoideae > Arctostaphylos | Ericaceae > subfam. Arbutoideae > Arctostaphylos |
Sibling taxa | ||
Synonyms | A. andersonii var. imbricata | A. insularis var. pubescens |
Name authority | Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 , | Greene ex Parry: Bull. Calif. Acad. Sci. 2: 494. 1887 , |
Web links |