Arctostaphylos nortensis

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

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

Common names: Del Norte manzanita
EndemicConservation concern
Basionym: 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


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


Lower Taxa

... more about "Arctostaphylos nortensis"
V. Thomas Parker +, Michael C. Vasey +  and Jon E. Keeley +
(P. V. Wells) P. V. Wells +
Arctostaphylos columbiana subsp. nortensis +
Del Norte manzanita +
Calif. +  and Oreg. +
400-600 m +
Chaparral, open forests +
Flowering late winter–late spring. +
Four Seasons +
Endemic +  and Conservation concern +
Undefined tribe Arbuteae +
Arctostaphylos nortensis +
Arctostaphylos +
species +