Arctostaphylos pilosula

Jepson & Wieslander

Erythea 8: 101. 1938 ,.

Common names: La Panza manzanita
EndemicConservation concern
Synonyms: Arctostaphylos pilosula subsp. pismoensis P. V. Wells Arctostaphylos wellsii
Treatment appears in FNA Volume 8. Treatment on page 426. Mentioned on page 414, 427.

Shrubs, erect, 1–5 m; burl absent; twigs short-hairy and hispid. Leaves: petiole 4–8 mm; blade dark green to gray-glaucous, dull, narrowly elliptic to orbiculate-ovate, 1–3 × 1–2 cm, base cuneate or truncate to slightly lobed, margins entire, plane, surfaces smooth, glabrous. Inflorescences racemes, simple or 1-branched; immature inflorescence pendent, axis 1–2 cm, 1+ mm diam., short-hairy with long hairs; bracts not appressed, (green), leaflike, lanceolate, 8–15 mm, apex acute, surfaces long-hairy. Pedicels 2–5 mm, glabrous. Flowers: corolla white to pink, urceolate; ovary glabrous. Fruits depressed-globose, 8–10 mm diam., glabrous. Stones distinct. 2n = 26.


Phenology: Flowering winter–early spring.
Habitat: Chaparral, open forests
Elevation: 0-1200 m

Discussion

Of conservation concern.

Arctostaphylos pilosula occurs in San Luis Obispo County and exhibits some variation in leaf shape and color, as well as indument. Plants at higher elevations and farther inland may reflect introgression with A. glauca. Some lower-elevation populations historically have been segregated as subsp. pismoensis or A. wellsii. Field observation suggests that there is a morphological cline between coastal and interior populations so that taxonomic distinctions between these populations are unwarranted. Further taxonomic analysis might help to resolve this situation.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

... more about "Arctostaphylos pilosula"
V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
Jepson & Wieslander +
short-hairy +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
not furrowed +
gray +  and reddish +
persistent +
exfoliating +
truncate;slightly lobed +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
gray-glaucous +
narrowly elliptic;orbiculate-ovate +
coriaceous +
1cm;2cm +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
lanceolate +
La Panza manzanita +
white +  and pink +
rotate to crateriform campanulate cylindric globose or urceolate +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
0-1200 m +
undifferentiated +
fusiform +
stonelike +
indehiscent +
depressed-globose +
Chaparral, open forests +
multicellular +
1-branched +  and simple +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
reduced +
not sticky +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering winter–early spring. +
4-5-carpellate +
not +  and connate +
connate +  and distinct +
globose +
persistent +
distinct +
ovate +  and deltate +
Endemic +  and Conservation concern +
prostrate +  and erect +
peltate +  and capitate +
distinct +
straight +
long-hairy +  and glabrous +
Arctostaphylos pilosula subsp. pismoensis +  and Arctostaphylos wellsii +
Arctostaphylos pilosula +
Arctostaphylos +
species +
hispid +  and short-hairy +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
heterotrophic +, autotrophic +  and mycotrophic +