Flora of North America species comparison

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Arctostaphylos auriculata

Arctostaphylos montereyensis

Mount Diablo manzanita, Mt. Diablo manzanita

Monterey manzanita, toro manzanita
Habit Shrubs, erect, 1–4.5 m; burl absent; twigs densely white-hairy with long, white hairs. Shrubs, erect, 1–3 m; burl absent; twigs finely glandular-hairy.
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 4–6 mm;

blade light green, reddish, or slightly glaucous, dull, orbiculate-ovate to orbiculate, 2–3 × 1.5–3 cm, base rounded, truncate, or slightly lobed, margins entire, plane, surfaces papillate, scabrous, finely glandular-hairy.
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, 4–10-branched;

immature inflorescence pendent, branches crowded, axis 1–2 cm, 1+ mm diam., densely glandular-hairy;

bracts not appressed, (green), leaflike, lanceolate, 3–12 mm, apex acuminate, surfaces glandular-hairy.
Pedicels

4–10 mm, tomentose.

5–6 mm, finely glandular-hairy.
Flowers

corolla white to pink, conic;

ovary densely white-hairy.

corolla white, urceolate;

ovary glandular-hairy.
Fruits

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

depressed-globose, 8–12 mm diam., finely glandular-hairy, (viscid).
Stones

distinct.

distinct or partially connate.
2n

= 26.

= 26.

Arctostaphylos auriculata

Arctostaphylos montereyensis
Phenology Flowering winter–early spring. Flowering winter–early spring.
Habitat Chaparral, open, closed-cone conifer forests Maritime chaparral
Elevation 300-500 m (1000-1600 ft) 0-500 m (0-1600 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[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.)

Of conservation concern.

Arctostaphylos montereyensis is known from sandy soils, ranging from dunes to sandstone outcrops, in the southern Monterey Bay area, Monterey County. Plants found on Fort Ord with auriculate leaf bases and blue-green leaves may represent hybrids with A. pajaroensis.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 430. FNA vol. 8, p. 426.
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. 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. 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
Name authority Eastwood: Bull. Torrey Bot. Club 32: 202. 1905 , Hoover: Leafl. W. Bot. 10: 87. 1964 ,
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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