Arctostaphylos densiflora

M. S. Baker

Leafl. W. Bot. 1: 31. 1932 ,.

Common names: Vine Hill manzanita
EndemicConservation concern
Treatment appears in FNA Volume 8. Treatment on page 419. Mentioned on page 412.

Shrubs, erect or mound-forming, ca. 1 m; burl absent; twigs sparsely short-hairy. Leaves: petiole 4–5 mm; blade bright green, lustrous, elliptic to narrowly lanceolate-elliptic, 1–2.5 × 0.5–1.5 cm, base cuneate to obtuse, margins entire, plane, surfaces smooth, sparsely puberulent. Inflorescences panicles, 3–5-branched; immature inflorescence pendent, (compact), branches ± spreading, axis 1–1.5 cm, 1+ mm diam., sparsely short-hairy; bracts not appressed, scalelike, deltate to awl-like, 1.5–3 mm (longer than buds), apex acute, surfaces glabrous. Pedicels 4–5 mm, glabrous. Flowers: corolla white, urceolate; ovary glabrous. Fruits subglobose, 5–6 mm diam., glabrous. Stones distinct. 2n = 26.


Phenology: Flowering winter–early spring.
Habitat: Acidic marine sands
Elevation: 100 m

Discussion

Of conservation concern.

Arctostaphylos densiflora is known only from Vine Hill, Sonoma County. It is the primary source of one of the most widely planted horticultural varieties of the genus (McMinn manzanita). It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

... more about "Arctostaphylos densiflora"
V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
M. S. Baker +
short-hairy +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not furrowed +
gray +  and reddish +
persistent +
exfoliating +
cuneate;obtuse +
lanceolate-elliptic +  and elliptic to narrowly +
bright green +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
ovate;elliptic +
coriaceous +
0.5cm;1.5cm +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
deltate +  and awl-like +
Vine Hill manzanita +
rotate to crateriform campanulate cylindric globose or urceolate +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
undifferentiated +
fusiform +
stonelike +
indehiscent +
subglobose +
Acidic marine sands +
multicellular +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
reduced +
not sticky +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 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 +
glabrous +  and puberulent +
Undefined tribe Arbuteae +
Arctostaphylos densiflora +
Arctostaphylos +
species +
short-hairy +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
shrub +  and mound-forming +
heterotrophic +, autotrophic +  and mycotrophic +