Arctostaphylos pacifica

Roof

Leafl. W. Bot. 9: 217. 1962 ,.

Common names: Pacific manzanita
EndemicConservation concern
Treatment appears in FNA Volume 8. Treatment on page 415. Mentioned on page 406, 408, 409.

Shrubs, prostrate or mound-forming, 0.1–0.3 m; burl present, sometimes epicormic; twigs short-hairy. Leaves: petiole 2–4 mm; blade light green abaxially, dark green adaxially, shiny, elliptic, 1–2 × 0.5–1 cm, base cuneate, margins serrulate, plane, surfaces smooth, sparsely hairy. Inflorescences racemes, (simple or 1-branched); immature inflorescence pendent, (congested), axis 0.5–1 cm, 1+ mm diam., short-hairy; bracts appressed, scalelike, awl-like, 0.5–1 mm, apex acute, glabrous. Pedicels 3–5 mm, glabrous. Flowers: corolla white, urceolate; ovary glabrous. Fruits (reddish), globose, 6–8 mm diam., glabrous. Stones distinct.


Phenology: Flowering winter–early spring.
Habitat: Sandstone outcrops
Elevation: 300 m

Discussion

Of conservation concern.

A distinctive species with an uncertain origin, Arctostaphylos pacifica has often been relegated to hybrid status and ignored; it displays a number of unique characters not found in any other species. It is found only at one location, San Bruno Mountain, the northern part of the Santa Cruz Mountains, San Mateo County. The relationships of this species need additional study.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

... more about "Arctostaphylos pacifica"
V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
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 +
cuneate +
dark green +  and light green +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
ovate;elliptic +
coriaceous +
0.5cm;1cm +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
awl-like +  and scale-like +
Pacific manzanita +
rotate to crateriform campanulate cylindric globose or urceolate +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
undifferentiated +
fusiform +
stonelike +
indehiscent +
globose +
Sandstone outcrops +
multicellular +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
reduced +
not sticky +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering winter–early spring. +
4-5-carpellate +
Leafl. W. Bot. +
not +  and connate +
connate +  and distinct +
globose +
persistent +
distinct +
ovate +  and deltate +
Endemic +  and Conservation concern +
prostrate +  and erect +
peltate +  and capitate +
distinct +
straight +
Undefined tribe Arbuteae +
Arctostaphylos pacifica +
Arctostaphylos +
species +
short-hairy +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
shrub +, mound-forming +  and prostrate +
heterotrophic +, autotrophic +  and mycotrophic +