FNA: Arctostaphylos imbricata vs. Arctostaphylos silvicola

	Arctostaphylos imbricata	Arctostaphylos silvicola
	San Bruno Mountain manzanita	Bonny Doon manzanita, silverleaf manzanita
Habit	Shrubs, prostrate or mat- or mound-forming, 0.1–1 m; burl absent; twigs densely fine-hairy with long, gland-tipped hairs.	Shrubs, erect, 1–3 m; burl absent; twigs sparsely to densely soft-hairy.
Leaves	petiole to 2 mm; blade light green, dull, orbiculate to orbiculate-ovate, 2.5–4 × 2–3 cm, base auriculate-clasping, margins entire, plane, surfaces papillate, ± scabrous, sparsely glandular-hairy.	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, 3–5-branched; immature inflorescence pendent, (branches densely clustered, ± sessile), axis 0.5–1 cm, 1+ mm diam., densely fine-hairy with long, gland-tipped hairs; bracts appressed, leaflike, ovate, 5–10 mm, apex acute, surfaces glandular-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	3–5 mm, densely glandular-hairy.	5–7 mm, usually glabrous, sometimes sparsely hairy.
Flowers	corolla white, urceolate; ovary densely glandular-hairy.	corolla white, conic to urceolate; ovary glabrous.
Fruits	depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid).	globose, 6–12 mm diam., glabrous.
Stones	distinct.	distinct.
2n	= 26.	= 26.

	Arctostaphylos imbricata	Arctostaphylos silvicola
Phenology	Flowering winter–early spring.	Flowering winter–early spring.
Habitat	Maritime chaparral on sandstone outcroppings	Chaparral, open conifer forests
Elevation	100-200 m (300-700 ft)	100-500 m (300-1600 ft)
Distribution	CA [WildflowerSearch map] [BONAP county map]	CA [WildflowerSearch map] [BONAP county map]
Discussion	Of conservation concern. Arctostaphylos imbricata occurs on San Bruno Mountain in San Mateo County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (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. 435.	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. gabilanensis, A. glandulosa, A. glauca, A. glutinosa, A. hispidula, A. hookeri, A. hooveri, 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
Synonyms	A. andersonii var. imbricata
Name authority	Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 ,	Jepson & Wieslander: Erythea 8: 101. 1938 ,
Web links	Local floras: CA Local Web sites: CalFlora, CalPhotos WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA Local Web sites: CalFlora, CalPhotos WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Arctostaphylos imbricata

Arctostaphylos silvicola

San Bruno Mountain manzanita

Bonny Doon manzanita, silverleaf manzanita

Habit

Shrubs, prostrate or mat- or mound-forming, 0.1–1 m; burl absent; twigs densely fine-hairy with long, gland-tipped hairs.

Shrubs, erect, 1–3 m; burl absent; twigs sparsely to densely soft-hairy.

Leaves

petiole to 2 mm;

blade light green, dull, orbiculate to orbiculate-ovate, 2.5–4 × 2–3 cm, base auriculate-clasping, margins entire, plane, surfaces papillate, ± scabrous, sparsely glandular-hairy.

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, 3–5-branched;

immature inflorescence pendent, (branches densely clustered, ± sessile), axis 0.5–1 cm, 1+ mm diam., densely fine-hairy with long, gland-tipped hairs;

bracts appressed, leaflike, ovate, 5–10 mm, apex acute, surfaces glandular-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

3–5 mm, densely glandular-hairy.

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

Flowers

corolla white, urceolate;

ovary densely glandular-hairy.

corolla white, conic to urceolate;

ovary glabrous.

Fruits

depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid).

globose, 6–12 mm diam., glabrous.

Stones

distinct.

= 26.

Arctostaphylos imbricata

Arctostaphylos silvicola

Phenology

Flowering winter–early spring.

Habitat

Maritime chaparral on sandstone outcroppings

Chaparral, open conifer forests

Elevation

100-200 m (300-700 ft)

100-500 m (300-1600 ft)

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Of conservation concern.

Arctostaphylos imbricata occurs on San Bruno Mountain in San Mateo County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(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. 435.

FNA vol. 8, p. 430.

Parent taxa

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. 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

Synonyms

A. andersonii var. imbricata

Name authority

Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 ,

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).

Choose a data source: Flora of North America

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Flora of North America species comparison

Arctostaphylos imbricata

Arctostaphylos silvicola

Arctostaphylos imbricata

Arctostaphylos silvicola