Flora of North America species comparison

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Arctostaphylos rudis

Arctostaphylos montana

sand mesa manzanita, shagbark manzanita

Mt. Tamalpais manzanita
Habit Shrubs, erect, 1–3 m; burl present or absent; bark on older stems persistent, gray, shredded; twigs sparsely short-hairy. Shrubs, erect, prostrate, or mound-forming, 0.1–2 m; burl absent; twigs densely white short-hairy.
Leaves

erect;

petiole 3–8 mm;

blade bright green, shiny, elliptic, 1–3 × 1–2 cm, base cuneate to rounded, margins entire, plane, surfaces smooth, puberulent, glabrescent.

petiole 2–6 mm;

blade dark green, shiny, orbiculate-elliptic to elliptic, 1–2.5 × 1–1.5 cm, base rounded to cuneate, margins entire, plane, surfaces smooth, puberulent, glabrescent.
Inflorescences

racemes, (simple or 1-branched);

immature inflorescence pendent, axis 0.5–1 cm, 1+ mm diam., sparsely short-hairy;

bracts not appressed, scalelike, deltate, 2–6 mm, apex acuminate, surfaces glabrous.

panicles, 1–3-branched;

immature inflorescence pendent, (branches compact), axis 0.5–1.5 cm, 1+ mm diam., densely white short-hairy;

bracts tightly appressed, scalelike, ovate, 2–5 mm, apex acuminate, surfaces glabrous.
Pedicels

3–6 mm, glabrous.

3–6 mm, glabrous.
Flowers

corolla white, conic to urceolate;

ovary glabrous.

corolla white, conic to urceolate;

ovary glabrous.
Fruits

depressed-globose, 8–14 mm diam., glabrous.

globose, 4–8 mm diam., glabrous.
Stones

distinct.

distinct.
2n

= 26.

Arctostaphylos rudis

Arctostaphylos montana
Phenology Flowering winter–early spring.
Habitat Maritime chaparral on sandy soils
Elevation 0-100 m (0-300 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from USDA
wc Calif
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Arctostaphylos rudis is found along the coast in Nipomo and Burton mesas and Point Sal, Santa Barbara and San Luis Obispo counties.

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

Subspecies 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Fruits 6-8 mm diam.; plants mound-forming or erect; leaf blades orbiculate-elliptic to elliptic, 1-2.5 × 1-1.5 cm; young twigs white-tomentose.
subsp. montana
1. Fruits 4-5 mm diam.; plants prostrate; leaf blades orbiculate-elliptic, 1-2 × 1-1.5 cm; young twigs gray-tomentose.
subsp. ravenii
Source FNA vol. 8, p. 416. FNA vol. 8, p. 436.
Parent taxa Ericaceae > subfam. Arbutoideae > Arctostaphylos Ericaceae > subfam. Arbutoideae > Arctostaphylos
Sibling taxa
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. 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. 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. 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. montana subsp. montana, A. montana subsp. ravenii
Synonyms A. hookeri subsp. montana, A. pungens var. montana
Name authority Jepson & Weislander: Erythea 8: 100. 1938 , Eastwood: Proc. Calif. Acad. Sci., ser. 3, 1: 83. (1897)
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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