Arctostaphylos nortensis

(P. V. Wells) P. V. Wells

Four Seasons 9(2): 56. 1992 ,.

Common names: Del Norte manzanita
EndemicConservation concern
Basionyms: Arctostaphylos columbiana subsp. nortensis P. V. Wells Four Seasons 8(1): 50. 1988
Treatment appears in FNA Volume 8. Treatment on page 428. Mentioned on page 413, 429.

Shrubs or trees, erect, 2–5 m; burl absent; twigs soft-hairy with minute glands on cryptic, short hairs or at tips of longer, hispid hairs. Leaves: petiole 4–5 mm; blade gray-glaucous, becoming dark green, dull, narrowly elliptic-ovate, 2–4 × 1–2 cm, base truncate to rounded, margins entire, plane, (sometimes sparsely ciliate), surfaces smooth, finely white-tomentose or glabrous. Inflorescences racemes, simple or 1-branched; immature inflorescence pendent, (branches crowded, bell-shaped, ± obscured by bracts), axis 0.5–1.2 cm, 1+ mm diam., soft-hairy with minute glands on cryptic, short hairs or at tips of longer, hispid hairs; bracts not appressed, (green), leaflike, ovate, 5–10 mm, apex acute, surfaces hairy, (also with longer hairs). Pedicels 2–4 mm, sparsely white-hairy. Flowers: corolla white, conic to urceolate; ovary densely white-hairy. Fruits depressed-globose, 6–8 mm diam., sparsely white-hairy. Stones distinct. 2n = 26.


Phenology: Flowering late winter–late spring.
Habitat: Chaparral, open forests
Elevation: 400-600 m

Discussion

Of conservation concern.

Arctostaphylos nortensis occurs on upland peridodite soils in the interior mountains of Del Norte County, California, and adjacent Curry and Josephine counties, Oregon. It appears to be a distinct entity and well distributed in this limited region; it could be confused with hybrids between A. canescens and A. viscida that have been described from the interior portion of its range. In the protologue, Wells did not mention their glandular pubescence, clearly visible on the type specimen; this feature can be difficult to discern in some herbarium specimens. The region of northwestern California and adjacent southwestern Oregon needs more study, this taxon being one example.

Selected References

None.

Lower Taxa

None.

"entire" is not a number.

... more about "Arctostaphylos nortensis"
V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
(P. V. Wells) P. V. Wells +
soft-hairy +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
not furrowed +
gray +  and reddish +
persistent +
exfoliating +
truncate;rounded +
Arctostaphylos columbiana subsp. nortensis +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
gray-glaucous +
elliptic-ovate +
coriaceous +
1cm;2cm +
not imbricate +  and imbricate +
hue +, light-brown +  and tan +
persistent +
Del Norte manzanita +
rotate to crateriform campanulate cylindric globose or urceolate +
Calif. +  and Oreg. +
brown +, reddish-brown +  and red +
depressed-globose +  and globose +
400-600 m +
undifferentiated +
fusiform +
stonelike +
indehiscent +
white-hairy +
depressed-globose +
Chaparral, open forests +
multicellular +
1-branched +  and simple +
opposite +, whorled +  and alternate +
pubescence +  and color +
persistent +
parietal +, axile +  and placentation +
white-hairy +
tenuinucellate +  and unitegmic +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
reduced +
not sticky +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering late winter–late spring. +
4-5-carpellate +
Four Seasons +
not +  and connate +
connate +  and distinct +
globose +
persistent +
distinct +
ovate +  and deltate +
Endemic +  and Conservation concern +
prostrate +  and erect +
peltate +  and capitate +
distinct +
straight +
hairy +, glabrous +, white-tomentose +  and smooth +
Undefined tribe Arbuteae +
Arctostaphylos nortensis +
Arctostaphylos +
species +
soft-hairy +
achlorophyllous +  and chlorophyllous +
evergreen +, deciduous +  and perennial +
tree +  and shrub +
heterotrophic +, autotrophic +  and mycotrophic +