FNA: Arctostaphylos auriculata vs. Arctostaphylos catalinae

	Arctostaphylos auriculata	Arctostaphylos catalinae
	Mount Diablo manzanita, Mt. Diablo manzanita	Santa Catalina Island manzanita
Habit	Shrubs, erect, 1–4.5 m; burl absent; twigs densely white-hairy with long, white hairs.	Shrubs or trees, erect, 2–5 m; burl absent; twigs densely glandular-hairy with long, white hairs.
Leaves	petiole to 2 mm; blade whitish gray, dull, oblong-ovate to orbiculate-ovate, 1.5–4.5 × 1.5–3 cm, base distinctly lobed, auriculate-clasping, margins entire, plane, surfaces smooth, gray-canescent, glabrescent.	petiole 2–6 mm; blade green-glaucescent, dull, lanceolate-ovate to elliptic, 2–5 × 1.5–3 cm, base truncate to ± slightly lobed, margins entire or ± serrate, plane, surfaces papillate, scabridulous, glandular-hispid.
Inflorescences	panicles, 3–5-branched; immature inflorescence pendent, (branches crowded, ± obscured by bracts), axis 1–1.5 cm, 1+ mm diam., densely white-hairy with long, white hairs; bracts somewhat appressed, leaflike, ovate to lanceolate-ovate, 5–15 mm, apex acute, surfaces canescent.	panicles, 4–10-branched; immature inflorescence pendent, branches ± spreading, axis 2–3 cm, 1+ mm diam., densely glandular-hairy with long, white hairs; bracts not appressed, (overlapping on distal 1/2, green), leaflike, lanceolate to narrowly ovate, 6–10(–15) mm, apex acute, surfaces sparsely glandular-hairy.
Pedicels	4–10 mm, tomentose.	2–5 mm, densely white-hairy.
Flowers	corolla white to pink, conic; ovary densely white-hairy.	corolla white, conic to urceolate; ovary densely white-hairy, sparsely glandular-hairy.
Fruits	depressed-globose, 5–10 mm diam., short white-hairy, glabrescent.	globose, 8–15 mm diam., sparsely hairy.
Stones	distinct.	distinct.
2n	= 26.	= 26.

	Arctostaphylos auriculata	Arctostaphylos catalinae
Phenology	Flowering winter–early spring.	Flowering winter–early spring.
Habitat	Chaparral, open, closed-cone conifer forests	Chaparral, open woodlands
Elevation	300-500 m (1000-1600 ft)	0-500 m (0-1600 ft)
Distribution	CA [BONAP county map]	CA [BONAP county map]
Discussion	Of conservation concern. Arctostaphylos auriculata is found on the western slopes of Mount Diablo in Contra Costa County. (Discussion copyrighted by Flora of North America; reprinted with permission.)	Of conservation concern. Arctostaphylos catalinae is known from Santa Catalina Island. (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 8, p. 430.	FNA vol. 8, p. 427.
Parent taxa	Ericaceae > subfam. Arbutoideae > Arctostaphylos	Ericaceae > subfam. Arbutoideae > Arctostaphylos
Sibling taxa	A. andersonii, 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. virgata, A. viridissima, A. viscida	A. andersonii, A. auriculata, A. bakeri, A. canescens, 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. virgata, A. viridissima, A. viscida
Name authority	Eastwood: Bull. Torrey Bot. Club 32: 202. 1905 ,	P. V. Wells: Madroño 19: 193. 1968 ,
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 auriculata

Arctostaphylos catalinae

Mount Diablo manzanita, Mt. Diablo manzanita

Santa Catalina Island manzanita

Habit

Shrubs, erect, 1–4.5 m; burl absent; twigs densely white-hairy with long, white hairs.

Shrubs or trees, erect, 2–5 m; burl absent; twigs densely glandular-hairy with long, white hairs.

Leaves

petiole to 2 mm;

blade whitish gray, dull, oblong-ovate to orbiculate-ovate, 1.5–4.5 × 1.5–3 cm, base distinctly lobed, auriculate-clasping, margins entire, plane, surfaces smooth, gray-canescent, glabrescent.

petiole 2–6 mm;

blade green-glaucescent, dull, lanceolate-ovate to elliptic, 2–5 × 1.5–3 cm, base truncate to ± slightly lobed, margins entire or ± serrate, plane, surfaces papillate, scabridulous, glandular-hispid.

Inflorescences

panicles, 3–5-branched;

immature inflorescence pendent, (branches crowded, ± obscured by bracts), axis 1–1.5 cm, 1+ mm diam., densely white-hairy with long, white hairs;

bracts somewhat appressed, leaflike, ovate to lanceolate-ovate, 5–15 mm, apex acute, surfaces canescent.

panicles, 4–10-branched;

immature inflorescence pendent, branches ± spreading, axis 2–3 cm, 1+ mm diam., densely glandular-hairy with long, white hairs;

bracts not appressed, (overlapping on distal 1/2, green), leaflike, lanceolate to narrowly ovate, 6–10(–15) mm, apex acute, surfaces sparsely glandular-hairy.

Pedicels

4–10 mm, tomentose.

2–5 mm, densely white-hairy.

Flowers

corolla white to pink, conic;

ovary densely white-hairy.

corolla white, conic to urceolate;

ovary densely white-hairy, sparsely glandular-hairy.

Fruits

depressed-globose, 5–10 mm diam., short white-hairy, glabrescent.

globose, 8–15 mm diam., sparsely hairy.

Stones

distinct.

= 26.

Arctostaphylos auriculata

Arctostaphylos catalinae

Phenology

Flowering winter–early spring.

Habitat

Chaparral, open, closed-cone conifer forests

Chaparral, open woodlands

Elevation

300-500 m (1000-1600 ft)

0-500 m (0-1600 ft)

Distribution

[BONAP county map]

Discussion

Of conservation concern.

Arctostaphylos auriculata is found on the western slopes of Mount Diablo in Contra Costa County.

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

Of conservation concern.

Arctostaphylos catalinae is known from Santa Catalina Island.

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

Source

FNA vol. 8, p. 430.

FNA vol. 8, p. 427.

Parent taxa

Ericaceae > subfam. Arbutoideae > Arctostaphylos

Sibling taxa

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

A. andersonii, A. auriculata, A. bakeri, A. canescens, 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. virgata, A. viridissima, A. viscida

Name authority

Eastwood: Bull. Torrey Bot. Club 32: 202. 1905 ,

P. V. Wells: Madroño 19: 193. 1968 ,

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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Arctostaphylos auriculata

Arctostaphylos catalinae

Arctostaphylos auriculata

Arctostaphylos catalinae