FNA: Arctostaphylos imbricata vs. Arctostaphylos virgata

	Arctostaphylos imbricata	Arctostaphylos virgata
	San Bruno Mountain manzanita	Bolinas manzanita, Marin 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, 1–5 m; burl absent; twigs densely glandular-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 2–4 mm; blade bright green, ± shiny, narrowly oblong-ovate to oblong-lanceolate, 3–5 × 1–2.5 cm, base truncate to slightly lobed, margins entire, plane, surfaces papillate, sparsely glandular-hairy.
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.	racemes, simple or 1-branched; immature inflorescence pendent, (concealed by bracts), axis 1.5–2 cm, 1+ mm diam., densely glandular-hairy; bracts not appressed, (green), leaflike, linear-lanceolate, 8–20 mm, apex acuminate, surfaces densely glandular-hairy.
Pedicels	3–5 mm, densely glandular-hairy.	3–8 mm, finely glandular-hairy.
Flowers	corolla white, urceolate; ovary densely glandular-hairy.	corolla white, conic to urceolate; ovary glandular-hairy.
Fruits	depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid).	depressed-globose, 6–8 mm diam., finely glandular-hairy, (viscid).
Stones	distinct.	distinct.
2n	= 26.	= 26.

	Arctostaphylos imbricata	Arctostaphylos virgata
Phenology	Flowering winter–early spring.	Flowering early winter–early spring.
Habitat	Maritime chaparral on sandstone outcroppings	Maritime chaparral, open, closed-cone conifer forests
Elevation	100-200 m (300-700 ft)	0-500 m (0-1600 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 virgata is associated mostly with Pinus muricata on the Point Reyes peninsula; populations are found at nearby sites from Bolinas Ridge, Muir Woods, and San Geronimo Ridge, Marin County. (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 8, p. 435.	FNA vol. 8, p. 426.
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. silvicola, A. stanfordiana, A. tomentosa, A. uva-ursi, A. viridissima, A. viscida
Synonyms	A. andersonii var. imbricata
Name authority	Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 ,	Eastwood: in C. S. Sargent, Trees & Shrubs 1: 203, plate 96. 1905 ,
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 virgata

San Bruno Mountain manzanita

Bolinas manzanita, Marin 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, 1–5 m; burl absent; twigs densely glandular-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 2–4 mm;

blade bright green, ± shiny, narrowly oblong-ovate to oblong-lanceolate, 3–5 × 1–2.5 cm, base truncate to slightly lobed, margins entire, plane, surfaces papillate, sparsely glandular-hairy.

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.

racemes, simple or 1-branched;

immature inflorescence pendent, (concealed by bracts), axis 1.5–2 cm, 1+ mm diam., densely glandular-hairy;

bracts not appressed, (green), leaflike, linear-lanceolate, 8–20 mm, apex acuminate, surfaces densely glandular-hairy.

Pedicels

3–5 mm, densely glandular-hairy.

3–8 mm, finely glandular-hairy.

Flowers

corolla white, urceolate;

ovary densely glandular-hairy.

corolla white, conic to urceolate;

ovary glandular-hairy.

Fruits

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

depressed-globose, 6–8 mm diam., finely glandular-hairy, (viscid).

Stones

distinct.

= 26.

Arctostaphylos virgata

Phenology

Flowering winter–early spring.

Flowering early winter–early spring.

Habitat

Maritime chaparral on sandstone outcroppings

Maritime chaparral, open, closed-cone conifer forests

Elevation

100-200 m (300-700 ft)

0-500 m (0-1600 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 virgata is associated mostly with Pinus muricata on the Point Reyes peninsula; populations are found at nearby sites from Bolinas Ridge, Muir Woods, and San Geronimo Ridge, Marin County.

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

Source

FNA vol. 8, p. 435.

FNA vol. 8, p. 426.

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. silvicola, A. stanfordiana, A. tomentosa, A. uva-ursi, A. viridissima, A. viscida

Synonyms

A. andersonii var. imbricata

Name authority

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

Eastwood: in C. S. Sargent, Trees & Shrubs 1: 203, plate 96. 1905 ,

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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Arctostaphylos imbricata

Arctostaphylos virgata

Arctostaphylos imbricata

Arctostaphylos virgata