Flora of North America species comparison

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Arctostaphylos rudis

Arctostaphylos pacifica

sand mesa manzanita, shagbark manzanita

Pacific manzanita
Habit Shrubs, erect, 1–3 m; burl present or absent; bark on older stems persistent, gray, shredded; twigs sparsely short-hairy. Shrubs, prostrate or mound-forming, 0.1–0.3 m; burl present, sometimes epicormic; twigs 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 2–4 mm;

blade light green abaxially, dark green adaxially, shiny, elliptic, 1–2 × 0.5–1 cm, base cuneate, margins serrulate, plane, surfaces smooth, sparsely hairy.
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.

racemes, (simple or 1-branched);

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

bracts appressed, scalelike, awl-like, 0.5–1 mm, apex acute, glabrous.
Pedicels

3–6 mm, glabrous.

3–5 mm, glabrous.
Flowers

corolla white, conic to urceolate;

ovary glabrous.

corolla white, urceolate;

ovary glabrous.
Fruits

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

(reddish), globose, 6–8 mm diam., glabrous.
Stones

distinct.

distinct.
2n

= 26.

Arctostaphylos rudis

Arctostaphylos pacifica
Phenology Flowering winter–early spring. Flowering winter–early spring.
Habitat Maritime chaparral on sandy soils Sandstone outcrops
Elevation 0-100 m (0-300 ft) 300 m (1000 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[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.)

Of conservation concern.

A distinctive species with an uncertain origin, Arctostaphylos pacifica has often been relegated to hybrid status and ignored; it displays a number of unique characters not found in any other species. It is found only at one location, San Bruno Mountain, the northern part of the Santa Cruz Mountains, San Mateo County. The relationships of this species need additional study.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 416. FNA vol. 8, p. 415.
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. 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. 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 Jepson & Weislander: Erythea 8: 100. 1938 , Roof: Leafl. W. Bot. 9: 217. 1962 ,
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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