Flora of North America species comparison

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Arctostaphylos hookeri

Arctostaphylos rudis

Hooker's manzanita, Raven's manzanita

sand mesa manzanita, shagbark manzanita
Habit Shrubs, prostrate or erect, mat- or mound-forming, 0.1–1.5 m; burl absent; bark on older stems persistent, reddish, smooth; twigs sparsely short-hairy. Shrubs, erect, 1–3 m; burl present or absent; bark on older stems persistent, gray, shredded; twigs sparsely short-hairy.
Leaves

petiole 1–8 mm;

blade bright green, shiny, narrow-elliptic (rhombic) or lanceolate-elliptic to widely elliptic, 0.8–3 × 0.4–1.5 cm, base rounded to cuneate, margins entire, plane, surfaces smooth, ± puberulent, glabrescent.

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.
Inflorescences

racemes, simple or 1-branched;

immature inflorescence pendent (crook-necked), axis 0.3–1 cm, 1+ mm diam., sparsely short-hairy;

bracts not appressed, (weakly spreading), (congested), (dark green), scalelike, deltate, (globose, cuplike), 2–5 mm, apex acute, surfaces glabrous.

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.
Pedicels

2–6 mm, glabrous.

3–6 mm, glabrous.
Flowers

corolla white, urceolate;

ovary glabrous.

corolla white, conic to urceolate;

ovary glabrous.
Fruits

globose, 3–6 mm diam., glabrous.

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

distinct.

distinct.
2n

= 26.

= 26.

Arctostaphylos hookeri

Arctostaphylos rudis
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 FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

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

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.)
Key
1. Plants erect or mound-forming; leaf blades ± elliptic, 2-3 × 1-1.5 cm; petioles 4-8 mm; Monterey Bay area.
subsp. hookeri
1. Plants prostrate, mat-forming; leaf blades narrow-elliptic (diamond-shaped), 0.8-1.2 × 0.4-0.7 cm; petioles 1-3 mm; San Luis Obispo County.
subsp. hearstiorum
Source FNA vol. 8, p. 417. FNA vol. 8, p. 416.
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. 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. 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
Subordinate taxa
A. hookeri subsp. hearstiorum, A. hookeri subsp. hookeri
Name authority G. Don: Gen. Hist. 3: 836. 1834 , Jepson & Weislander: Erythea 8: 100. 1938 ,
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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