Arctostaphylos osoensis

P. V. Wells

Four Seasons 9(2): 45. 1992 ,.

Common names: Oso manzanita
Treatment appears in FNA Volume 8. Treatment on page 434. Mentioned on page 406, 413.

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. 2n = 26.


Phenology: Flowering winter–early spring.
Habitat: Maritime chaparral on volcanic uplands
Elevation: 0-200 m

Discussion

Of conservation concern.

Arctostaphylos osoensis is found in the volcanic hills east of Morro Bay, San Luis Obispo County.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

... more about "Arctostaphylos osoensis"
V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
P. V. Wells +
short-hairy +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not furrowed +
gray +  and reddish +
persistent +
exfoliating +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
ovate;orbiculate-ovate +
coriaceous +
1.5cm;2.5cm +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
lanceolate +  and ovate +
Oso manzanita +
rotate to crateriform campanulate cylindric globose or urceolate +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
0-200 m +
undifferentiated +
fusiform +
stonelike +
indehiscent +
depressed-globose +
Maritime chaparral on volcanic uplands +
multicellular +
1-branched +  and simple +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
reduced +
not sticky +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering winter–early spring. +
4-5-carpellate +
Four Seasons +
not +  and connate +
connate +  and distinct +
globose +
persistent +
distinct +
ovate +  and deltate +
red +  and gray +
prostrate +  and erect +
peltate +  and capitate +
distinct +
straight +
glabrous +, short-hairy +  and smooth +
Undefined tribe Arbuteae +
Arctostaphylos osoensis +
Arctostaphylos +
species +
short-hairy +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
shrub +  and mound-forming +
heterotrophic +, autotrophic +  and mycotrophic +