Arctostaphylos montana subsp. ravenii

(P. V. Wells) V. T. Parker

Madroño 54: 150. 2007,.

Common names: Presidio manzanita
Basionyms: Arctostaphylos hookeri subsp. ravenii P. V. Wells Madroño 19: 200. 1968
Treatment appears in FNA Volume 8. Treatment on page 437. Mentioned on page 436.

Shrubs prostrate, 0.1–0.5 m; young twigs gray-tomentose. Leaf-blades orbiculate-elliptic, 1–2.2 × 1–1.5 cm. Fruits 4–5 mm diam. 2n = 52.


Phenology: Flowering early–late spring.
Habitat: Maritime chaparral, coastal prairie on serpentine soils
Elevation: 0-100 m

Discussion

Of conservation concern.

Subspecies ravenii occurs near the coast in San Francisco County. The relationship of this taxon is problematic; only one living individual is known from the wild. It is in the Center for Plant Conservation’s National Collection of Endangered Plants as Arctostaphylos hookeri subsp. ravenii.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
(P. V. Wells) V. T. Parker +
short-hairy +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not furrowed +
gray +  and reddish +
persistent +
exfoliating +
rounded;cuneate +
Arctostaphylos hookeri subsp. ravenii +
orbiculate-elliptic to elliptic +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
ovate;elliptic +
coriaceous +
1cm;1.5cm +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
ovate +  and scale-like +
Presidio manzanita +
rotate to crateriform campanulate cylindric globose or urceolate +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
0-100 m +
undifferentiated +
fusiform +
stonelike +
indehiscent +
globose +
Maritime chaparral, coastal prairie on serpentine soils +
multicellular +
1 cm10 mm <br />0.01 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
reduced +
not sticky +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering early–late spring. +
4-5-carpellate +
not +  and connate +
connate +  and distinct +
globose +
persistent +
distinct +
ovate +  and deltate +
prostrate +  and erect +
peltate +  and capitate +
distinct +
straight +
glabrous +, glabrescent +  and puberulent +
Arctostaphylos hookeri subsp. montana +  and Arctostaphylos pungens var. montana +
Arctostaphylos montana subsp. ravenii +
Arctostaphylos montana +
subspecies +
gray-tomentose +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
heterotrophic +, autotrophic +  and mycotrophic +