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Mount Diablo manzanita, Mt. Diablo manzanita

Eastwood manzanita, Eastwood's manzanita

Habit Shrubs, erect, 1–4.5 m; burl absent; twigs densely white-hairy with long, white hairs. Shrubs, erect or mound-forming, 1–3 m; burl present; twigs tomentose to short-hairy, with eglandular hairs or with long, clear, pink or dark, glandular hairs.
Leaves

petiole to 2 mm;

blade whitish gray, dull, oblong-ovate to orbiculate-ovate, 1.5–4.5 × 1.5–3 cm, base distinctly lobed, auriculate-clasping, margins entire, plane, surfaces smooth, gray-canescent, glabrescent.

petiole 5–10 mm;

blade bright green, slightly glaucous to strongly gray-glaucous, shiny or dull, elliptic to ovate, 2–4.5 × 1–2.5 cm, base cuneate to rounded, sometimes ± lobed or truncate, margins entire or toothed, plane, surfaces papillate, scabrous or smooth, glabrous or glandular-puberulent to -hairy, puberulent, or finely tomentose, sometimes glabrescent; (abaxial surface sometimes with more stomata than adaxial surface).

Inflorescences

panicles, 3–5-branched;

immature inflorescence pendent, (branches crowded, ± obscured by bracts), axis 1–1.5 cm, 1+ mm diam., densely white-hairy with long, white hairs;

bracts somewhat appressed, leaflike, ovate to lanceolate-ovate, 5–15 mm, apex acute, surfaces canescent.

panicles, 3–6-branched;

immature inflorescence pendent, (branches crowded, not concealed by bracts), axis 1–3 cm, 1+ mm diam., short-hairy to hairy, with or without glandular hairs;

bracts not appressed, variable, from scalelike and awl-like to leaflike and deltate, lanceolate, or broadly lanceolate (at least at base), 3–10 mm, apex acute, surfaces hairy or finely glandular-hairy.

Pedicels

4–10 mm, tomentose.

3–10 mm, sparsely hairy to finely glandular-hairy.

Flowers

corolla white to pink, conic;

ovary densely white-hairy.

corolla white to pink, conic to urceolate;

ovary densely white-hairy, sometimes glandular.

Fruits

depressed-globose, 5–10 mm diam., short white-hairy, glabrescent.

slightly (or markedly) depressed-globose, 6–10 mm diam., glabrous or finely glandular-hairy, (viscid).

Stones

distinct.

usually mostly distinct, sometimes connate.

2n

= 26.

Arctostaphylos auriculata

Arctostaphylos glandulosa

Phenology Flowering winter–early spring.
Habitat Chaparral, open, closed-cone conifer forests
Elevation 300-500 m (1000-1600 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA; OR; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Arctostaphylos auriculata is found on the western slopes of Mount Diablo in Contra Costa County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Subspecies 10 (8 in the flora).

Arctostaphylos glandulosa occurs in the California Floristic Province from southern Oregon to northern Baja California within the Coast, Transverse, and Peninsular ranges.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Twigs, bracts, and/or immature inflorescence axes glandular-hairy
→ 2
1. Twigs, bracts, and immature inflorescence axes not glandular-hairy
→ 4
2. Leaf blades strongly white-glaucous.
subsp. leucophylla
2. Leaf blades green to gray-green, not glaucous to moderately glaucous
→ 3
3. Twigs glandular-hairy; immature inflorescences usually glandular-hairy.
subsp. glandulosa
3. Twigs not glandular-hairy; immature inflorescences glandular-hairy; (interior and eastern side of Santa Lucia Mountains).
subsp. howellii
4. Twigs short-hairy and with longer, white hairs.
subsp. mollis
4. Twigs short-hairy, not glandular-hairy
→ 5
5. Leaf blades strongly white-glaucous.
subsp. adamsii
5. Leaf blades dark green to moderately gray-green
→ 6
6. Stones mostly connate into single or weakly connate sphere.
subsp. gabrielensis
6. Stones usually distinct
→ 7
7. Leaf blades dark green (margins often reddish); fruits markedly flattened into depressed-globose shape.
subsp. crassifolia
7. Leaf blades green or gray-green; fruits only slightly flattened into depressed-globose shape.
subsp. cushingiana
Source FNA vol. 8, p. 430. FNA vol. 8, p. 442.
Parent taxa Ericaceae > subfam. Arbutoideae > Arctostaphylos Ericaceae > subfam. Arbutoideae > Arctostaphylos
Sibling taxa
A. andersonii, A. bakeri, A. canescens, A. catalinae, A. columbiana, A. confertiflora, A. crustacea, A. cruzensis, A. densiflora, A. edmundsii, A. franciscana, A. gabilanensis, A. glandulosa, A. glauca, A. glutinosa, A. hispidula, A. hookeri, A. hooveri, A. imbricata, A. insularis, A. klamathensis, A. luciana, A. malloryi, A. manzanita, A. mewukka, A. montana, A. montaraensis, A. montereyensis, A. morroensis, A. myrtifolia, A. nevadensis, A. nissenana, A. nortensis, A. nummularia, A. obispoensis, A. ohloneana, A. osoensis, A. otayensis, A. pacifica, A. pajaroensis, A. pallida, A. parryana, A. patula, A. pechoensis, A. pilosula, A. pringlei, A. pumila, A. pungens, A. purissima, A. rainbowensis, A. refugioensis, A. regismontana, A. rudis, A. sensitiva, A. silvicola, A. stanfordiana, A. tomentosa, A. uva-ursi, A. virgata, A. viridissima, A. viscida
A. andersonii, A. auriculata, A. bakeri, A. canescens, A. catalinae, A. columbiana, A. confertiflora, A. crustacea, A. cruzensis, A. densiflora, A. edmundsii, A. franciscana, A. gabilanensis, A. glauca, A. glutinosa, A. hispidula, A. hookeri, A. hooveri, A. imbricata, A. insularis, A. klamathensis, A. luciana, A. malloryi, A. manzanita, A. mewukka, A. montana, A. montaraensis, A. montereyensis, A. morroensis, A. myrtifolia, A. nevadensis, A. nissenana, A. nortensis, A. nummularia, A. obispoensis, A. ohloneana, A. osoensis, A. otayensis, A. pacifica, A. pajaroensis, A. pallida, A. parryana, A. patula, A. pechoensis, A. pilosula, A. pringlei, A. pumila, A. pungens, A. purissima, A. rainbowensis, A. refugioensis, A. regismontana, A. rudis, A. sensitiva, A. silvicola, A. stanfordiana, A. tomentosa, A. uva-ursi, A. virgata, A. viridissima, A. viscida
Subordinate taxa
A. glandulosa subsp. adamsii, A. glandulosa subsp. crassifolia, A. glandulosa subsp. cushingiana, A. glandulosa subsp. gabrielensis, A. glandulosa subsp. glandulosa, A. glandulosa subsp. howellii, A. glandulosa subsp. leucophylla, A. glandulosa subsp. mollis
Name authority Eastwood: Bull. Torrey Bot. Club 32: 202. 1905 , Eastwood: Proc. Calif. Acad. Sci., ser. 3, 1: 82. 1897 ,
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