FNA: Arctostaphylos pallida vs. Arctostaphylos densiflora

	Arctostaphylos pallida	Arctostaphylos densiflora
	Alameda manzanita, pallid manzanita	Vine Hill manzanita
Habit	Shrubs, erect, 2–4 m; burl absent; twigs hairy.	Shrubs, erect or mound-forming, ca. 1 m; burl absent; twigs sparsely short-hairy.
Leaves	petiole to 2 mm, (hairy); blade glaucous-green, dull, ovate or oblong-ovate, 2.5–4.5 × 2–3 cm, base auriculate-clasping, margins entire, plane, surfaces smooth, glabrous.	petiole 4–5 mm; blade bright green, lustrous, elliptic to narrowly lanceolate-elliptic, 1–2.5 × 0.5–1.5 cm, base cuneate to obtuse, margins entire, plane, surfaces smooth, sparsely puberulent.
Inflorescences	panicles, 3–5-branched; immature inflorescence pendent, (branches compact, framed by bracts), axis 0.5–1 cm, 1+ mm diam., short-hairy to hispid-hairy, usually eglandular; bracts not appressed, leaflike, widely lanceolate, 5–9 mm, apex acute, surfaces finely glandular-hairy.	panicles, 3–5-branched; immature inflorescence pendent, (compact), branches ± spreading, axis 1–1.5 cm, 1+ mm diam., sparsely short-hairy; bracts not appressed, scalelike, deltate to awl-like, 1.5–3 mm (longer than buds), apex acute, surfaces glabrous.
Pedicels	8–12 mm, finely glandular-hairy.	4–5 mm, glabrous.
Flowers	corolla white, conic to urceolate; ovary finely glandular-hairy.	corolla white, urceolate; ovary glabrous.
Fruits	depressed-globose, 8–10 mm diam., glandular-hairy, (viscid).	subglobose, 5–6 mm diam., glabrous.
Stones	distinct.	distinct.
2n	= 26.	= 26.

	Arctostaphylos pallida	Arctostaphylos densiflora
Phenology	Flowering winter–early spring.	Flowering winter–early spring.
Habitat	Maritime chaparral, gaps in open forests	Acidic marine sands
Elevation	200-400 m (700-1300 ft)	100 m (300 ft)
Distribution	CA [BONAP county map]	CA [WildflowerSearch map] [BONAP county map]
Discussion	Of conservation concern. Arctostaphylos pallida is found on shale barrens in the East Bay Hills, western Contra Costa County, overlooking San Francisco Bay. (Discussion copyrighted by Flora of North America; reprinted with permission.)	Of conservation concern. Arctostaphylos densiflora is known only from Vine Hill, Sonoma County. It is the primary source of one of the most widely planted horticultural varieties of the genus (McMinn manzanita). It is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 8, p. 433.	FNA vol. 8, p. 419.
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. 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. 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. virgata, A. viridissima, A. viscida
Synonyms	A. andersonii var. pallida
Name authority	Eastwood: Leafl. W. Bot. 1: 76. 1933 ,	M. S. Baker: Leafl. W. Bot. 1: 31. 1932 ,
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 densiflora

Alameda manzanita, pallid manzanita

Vine Hill manzanita

Habit

Shrubs, erect, 2–4 m; burl absent; twigs hairy.

Shrubs, erect or mound-forming, ca. 1 m; burl absent; twigs sparsely short-hairy.

Leaves

petiole to 2 mm, (hairy);

blade glaucous-green, dull, ovate or oblong-ovate, 2.5–4.5 × 2–3 cm, base auriculate-clasping, margins entire, plane, surfaces smooth, glabrous.

petiole 4–5 mm;

blade bright green, lustrous, elliptic to narrowly lanceolate-elliptic, 1–2.5 × 0.5–1.5 cm, base cuneate to obtuse, margins entire, plane, surfaces smooth, sparsely puberulent.

Inflorescences

panicles, 3–5-branched;

immature inflorescence pendent, (branches compact, framed by bracts), axis 0.5–1 cm, 1+ mm diam., short-hairy to hispid-hairy, usually eglandular;

bracts not appressed, leaflike, widely lanceolate, 5–9 mm, apex acute, surfaces finely glandular-hairy.

panicles, 3–5-branched;

immature inflorescence pendent, (compact), branches ± spreading, axis 1–1.5 cm, 1+ mm diam., sparsely short-hairy;

bracts not appressed, scalelike, deltate to awl-like, 1.5–3 mm (longer than buds), apex acute, surfaces glabrous.

Pedicels

8–12 mm, finely glandular-hairy.

4–5 mm, glabrous.

Flowers

corolla white, conic to urceolate;

ovary finely glandular-hairy.

corolla white, urceolate;

ovary glabrous.

Fruits

depressed-globose, 8–10 mm diam., glandular-hairy, (viscid).

subglobose, 5–6 mm diam., glabrous.

Stones

distinct.

= 26.

Arctostaphylos densiflora

Phenology

Flowering winter–early spring.

Habitat

Maritime chaparral, gaps in open forests

Acidic marine sands

Elevation

200-400 m (700-1300 ft)

100 m (300 ft)

Distribution

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Of conservation concern.

Arctostaphylos pallida is found on shale barrens in the East Bay Hills, western Contra Costa County, overlooking San Francisco Bay.

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

Of conservation concern.

Arctostaphylos densiflora is known only from Vine Hill, Sonoma County. It is the primary source of one of the most widely planted horticultural varieties of the genus (McMinn manzanita). It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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

Source

FNA vol. 8, p. 433.

FNA vol. 8, p. 419.

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. 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. 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. 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. virgata, A. viridissima, A. viscida

Synonyms

A. andersonii var. pallida

Name authority

Eastwood: Leafl. W. Bot. 1: 76. 1933 ,

M. S. Baker: Leafl. W. Bot. 1: 31. 1932 ,

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 pallida

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Arctostaphylos pallida

Arctostaphylos densiflora