FNA: Arctostaphylos insularis vs. Arctostaphylos gabilanensis

	Arctostaphylos insularis	Arctostaphylos gabilanensis
	island manzanita	Gabilan manzanita, Gabilan Mountains manzanita
Habit	Shrubs, erect, (arborescent), 2–5 m; burl absent; (lower stems reddish with glaucous patches); twigs glabrous, sometimes sparsely short-hairy or sparsely glandular-hairy.	Shrubs or trees, erect, 1–5 m; burl absent; twigs sparsely short-hairy with sessile glands among hairs.
Leaves	bifacial in stomatal distribution; petiole 4–8 mm; blade bright green, lustrous, oblong-elliptic, 2.5–4.5 × 1–3 cm, base rounded, margins entire, ± cupped, surfaces smooth, glabrous.	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.
Inflorescences	panicles, 5–10-branched; immature inflorescence pendent, branches spreading, ascending, or erect, axis 2–3 cm, 1+ mm diam., glabrous, sometimes sparsely short-hairy or sparsely glandular-hairy, (buds ± spread apart); bracts not appressed, scalelike, deltate, 1.5–3 mm, apex acute, surfaces finely glandular-hairy.	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.
Pedicels	6–9 mm, finely glandular-hairy.	8–10 mm, hairy or glabrous.
Flowers	corolla white, conic to urceolate; ovary glabrous or sparsely glandular-hairy.	corolla white to pink, conic to urceolate; ovary glabrous, (not viscid).
Fruits	depressed-globose, 8–15 mm diam., sparsely hairy or glabrous.	globose, 10–15 mm diam., glabrous, (not viscid).
Stones	distinct.	connate into single sphere.
2n	= 26.	= 26.

	Arctostaphylos insularis	Arctostaphylos gabilanensis
Phenology	Flowering winter–early spring.	Flowering winter–early spring.
Habitat	Island chaparral and woodlands	Chaparral on decomposing granites
Elevation	200-400 m (700-1300 ft)	300-700 m (1000-2300 ft)
Distribution	CA [WildflowerSearch map] [BONAP county map]	CA [BONAP county map]
Discussion	Of conservation concern. Arctostaphylos insularis is known from Santa Cruz Island. (Discussion copyrighted by Flora of North America; reprinted with permission.)	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.)
Source	FNA vol. 8, p. 422.	FNA vol. 8, p. 431.
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. 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. 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. insularis var. pubescens
Name authority	Greene ex Parry: Bull. Calif. Acad. Sci. 2: 494. 1887 ,	V. T. Parker & M. C. Vasey: Madroño 51: 322, fig. 1. 2004 ,
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 insularis

Arctostaphylos gabilanensis

island manzanita

Gabilan manzanita, Gabilan Mountains manzanita

Habit

Shrubs, erect, (arborescent), 2–5 m; burl absent; (lower stems reddish with glaucous patches); twigs glabrous, sometimes sparsely short-hairy or sparsely glandular-hairy.

Shrubs or trees, erect, 1–5 m; burl absent; twigs sparsely short-hairy with sessile glands among hairs.

Leaves

bifacial in stomatal distribution;

petiole 4–8 mm;

blade bright green, lustrous, oblong-elliptic, 2.5–4.5 × 1–3 cm, base rounded, margins entire, ± cupped, surfaces smooth, glabrous.

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.

Inflorescences

panicles, 5–10-branched;

immature inflorescence pendent, branches spreading, ascending, or erect, axis 2–3 cm, 1+ mm diam., glabrous, sometimes sparsely short-hairy or sparsely glandular-hairy, (buds ± spread apart);

bracts not appressed, scalelike, deltate, 1.5–3 mm, apex acute, surfaces finely glandular-hairy.

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.

Pedicels

6–9 mm, finely glandular-hairy.

8–10 mm, hairy or glabrous.

Flowers

corolla white, conic to urceolate;

ovary glabrous or sparsely glandular-hairy.

corolla white to pink, conic to urceolate;

ovary glabrous, (not viscid).

Fruits

depressed-globose, 8–15 mm diam., sparsely hairy or glabrous.

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

Stones

distinct.

connate into single sphere.

= 26.

Arctostaphylos insularis

Arctostaphylos gabilanensis

Phenology

Flowering winter–early spring.

Habitat

Island chaparral and woodlands

Chaparral on decomposing granites

Elevation

200-400 m (700-1300 ft)

300-700 m (1000-2300 ft)

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Of conservation concern.

Arctostaphylos insularis is known from Santa Cruz Island.

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

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.)

Source

FNA vol. 8, p. 422.

FNA vol. 8, p. 431.

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. 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. 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. insularis var. pubescens

Name authority

Greene ex Parry: Bull. Calif. Acad. Sci. 2: 494. 1887 ,

V. T. Parker & M. C. Vasey: Madroño 51: 322, fig. 1. 2004 ,

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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Flora of North America species comparison

Arctostaphylos insularis

Arctostaphylos gabilanensis

Arctostaphylos insularis

Arctostaphylos gabilanensis