Arctostaphylos imbricata |
Arctostaphylos pilosula |
|
---|---|---|
San Bruno Mountain manzanita |
La Panza manzanita, Santa Margarita 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, 1–5 m; burl absent; twigs short-hairy and hispid. |
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 4–8 mm; blade dark green to gray-glaucous, dull, narrowly elliptic to orbiculate-ovate, 1–3 × 1–2 cm, base cuneate or truncate to slightly lobed, margins entire, plane, 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. |
racemes, simple or 1-branched; immature inflorescence pendent, axis 1–2 cm, 1+ mm diam., short-hairy with long hairs; bracts not appressed, (green), leaflike, lanceolate, 8–15 mm, apex acute, surfaces long-hairy. |
Pedicels | 3–5 mm, densely glandular-hairy. |
2–5 mm, glabrous. |
Flowers | corolla white, urceolate; ovary densely glandular-hairy. |
corolla white to pink, urceolate; ovary glabrous. |
Fruits | depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid). |
depressed-globose, 8–10 mm diam., glabrous. |
Stones | distinct. |
distinct. |
2n | = 26. |
= 26. |
Arctostaphylos imbricata |
Arctostaphylos pilosula |
|
Phenology | Flowering winter–early spring. | Flowering winter–early spring. |
Habitat | Maritime chaparral on sandstone outcroppings | Chaparral, open forests |
Elevation | 100-200 m (300-700 ft) | 0-1200 m (0-3900 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 pilosula occurs in San Luis Obispo County and exhibits some variation in leaf shape and color, as well as indument. Plants at higher elevations and farther inland may reflect introgression with A. glauca. Some lower-elevation populations historically have been segregated as subsp. pismoensis or A. wellsii. Field observation suggests that there is a morphological cline between coastal and interior populations so that taxonomic distinctions between these populations are unwarranted. Further taxonomic analysis might help to resolve this situation. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 8, p. 435. | FNA vol. 8, p. 426. |
Parent taxa | Ericaceae > subfam. Arbutoideae > Arctostaphylos | Ericaceae > subfam. Arbutoideae > Arctostaphylos |
Sibling taxa | ||
Synonyms | A. andersonii var. imbricata | A. pilosula subsp. pismoensis, A. wellsii |
Name authority | Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 , | Jepson & Wieslander: Erythea 8: 101. 1938 , |
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