Flora of North America species comparison

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Arctostaphylos gabilanensis

Arctostaphylos silvicola

Gabilan manzanita, Gabilan Mountains manzanita

Bonny Doon manzanita, silverleaf manzanita
Habit Shrubs or trees, erect, 1–5 m; burl absent; twigs sparsely short-hairy with sessile glands among hairs. Shrubs, erect, 1–3 m; burl absent; twigs sparsely to densely soft-hairy.
Leaves

petiole 1–4 mm;

blade gray-glaucous, dull, ovate, 1.5–3.5 × 1.1–2.4 cm, base distinctly lobed, auriculate-clasping, margins entire, plane, surfaces smooth, canescent, glabrescent.

petiole 3–8 mm;

blade gray, glaucous, dull, narrowly obovate or oblong-elliptic, 1.5–3.5 × 1–1.5 cm, base cuneate, margins entire, plane, surfaces smooth, appressed gray-canescent, glabrescent.
Inflorescences

panicles, 1–4-branched;

immature inflorescence pendent, branches spreading, axis 1–3 cm, 1+ mm diam., sparsely short-hairy with sessile glands among hairs;

bracts not appressed, (spreading), scalelike (lowermost leaflike), deltate, 3–5 mm, (fleshy), apex mucronate, surfaces hairy.

racemelike, simple or 1–2-branched;

immature inflorescence pendent, (branches bell-shaped, framed by bracts), axis 0.5–1 cm, 1+ mm diam., sparsely to densely soft-hairy;

bracts not appressed, leaflike, lanceolate, 5–12 mm, apex acute to obtuse, surfaces canescent or glabrous.
Pedicels

8–10 mm, hairy or glabrous.

5–7 mm, usually glabrous, sometimes sparsely hairy.
Flowers

corolla white to pink, conic to urceolate;

ovary glabrous, (not viscid).

corolla white, conic to urceolate;

ovary glabrous.
Fruits

globose, 10–15 mm diam., glabrous, (not viscid).

globose, 6–12 mm diam., glabrous.
Stones

connate into single sphere.

distinct.
2n

= 26.

= 26.

Arctostaphylos gabilanensis

Arctostaphylos silvicola
Phenology Flowering winter–early spring. Flowering winter–early spring.
Habitat Chaparral on decomposing granites Chaparral, open conifer forests
Elevation 300-700 m (1000-2300 ft) 100-500 m (300-1600 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Arctostaphylos gabilanensis is known from two disjunct populations in the Gabilan Mountains, San Benito and Monterey counties.

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

Of conservation concern.

Arctostaphylos silvicola is known from deep, sandy soils near the coast in chaparral and open conifer forests of the central Santa Cruz Mountains, Santa Cruz County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 431. FNA vol. 8, p. 430.
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. 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. 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. stanfordiana, A. tomentosa, A. uva-ursi, A. virgata, A. viridissima, A. viscida
Name authority V. T. Parker & M. C. Vasey: Madroño 51: 322, fig. 1. 2004 , Jepson & Wieslander: Erythea 8: 101. 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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