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Arctostaphylos osoensis
P.V. Wells
Family:
Ericaceae
Oso Manzanita
FNA
Resources
V. Thomas Parker, Michael C. Vasey, Jon E. Keeley in Flora of North America (vol. 8)
Shrubs,
erect or mound-forming, 1-4 m; burl absent; bark of older stems persistent, gray, shredded, sometimes red, smooth; twigs sparsely short-hairy.
Leaves:
petiole to 2 mm; blade dark green, ± shiny, ovate to orbiculate-ovate, 1.5-3 × 1.5-2.5 cm, base deeply lobed, (clasping), margins entire, plane, surfaces smooth, sparsely short-hairy or glabrous.
Inflorescences
racemes, simple or 1-branched; immature inflorescence pendent, (branches compact, framed by bracts), axis 0.5-1 cm, 1+ mm diam., sparsely short-hairy; bracts not appressed, leaflike, lanceolate to ovate, 4-8 mm, apex acute, surfaces glabrous.
Pedicels
8-9 mm, glabrous.
Flowers:
corolla white, urceolate; ovary glabrous.
Fruits
depressed-globose, 5-8 mm diam., glabrous.
Stones
distinct.
2
n
= 26.
Flowering winter-early spring. Maritime chaparral on volcanic uplands; of conservation concern; 0-200 m; Calif.
Arctostaphylos osoensis
is found in the volcanic hills east of Morro Bay, San Luis Obispo County.
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].
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