FNA: Arctostaphylos osoensis vs. Arctostaphylos cruzensis

	Arctostaphylos osoensis	Arctostaphylos cruzensis
	oso manzanita	Arroyo De La cruz manzanita, La Cruz manzanita
Habit	Shrubs, erect or mound-forming, 1–4 m; burl absent; bark of older stems persistent, gray, shredded, sometimes red, smooth; twigs sparsely short-hairy.	Shrubs, prostrate or mat- or mound-forming, 0.1–1 m; burl absent; twigs sparsely short-hairy to sparsely hairy.
Leaves	petiole to 2 mm; blade dark green, ± shiny, ovate to orbiculate-ovate, 1.5–3 × 1.5–2.5 cm, base deeply lobed, (clasping), margins entire, plane, surfaces smooth, sparsely short-hairy or glabrous.	petiole to 2 mm; blade bright green, shiny, oblong-ovate, 1.5–3 × 1–2.5 cm, base auriculate-clasping, margins entire or toothed, plane, (hairy-ciliate proximally), surfaces smooth, finely tomentose, glabrescent.
Inflorescences	racemes, simple or 1-branched; immature inflorescence pendent, (branches compact, framed by bracts), axis 0.5–1 cm, 1+ mm diam., sparsely short-hairy; bracts not appressed, leaflike, lanceolate to ovate, 4–8 mm, apex acute, surfaces glabrous.	panicles, 1–3-branched; immature inflorescence pendent, (branches crowded, bell-shaped, concealed by bracts), axis 0.5–1.5 cm, 1+ mm diam., sparsely short-hairy and hairy; bracts appressed, leaflike, lanceolate to lanceolate-ovate, 5–15 mm, apex acute, surfaces hairy.
Pedicels	8–9 mm, glabrous.	4–5 mm, sparsely hairy.
Flowers	corolla white, urceolate; ovary glabrous.	corolla white, urceolate; ovary densely white-hairy.
Fruits	depressed-globose, 5–8 mm diam., glabrous.	depressed-globose, 8–10 mm diam., glabrous.
Stones	distinct.	distinct.
2n	= 26.	= 26.

	Arctostaphylos osoensis	Arctostaphylos cruzensis
Phenology	Flowering winter–early spring.	Flowering winter–early spring.
Habitat	Maritime chaparral on volcanic uplands	Maritime chaparral, grasslands on alluvial and fluvial soils
Elevation	0-200 m (0-700 ft)	0-100 m (0-300 ft)
Distribution	CA [BONAP county map]	CA [BONAP county map]
Discussion	Of conservation concern. Arctostaphylos osoensis is found in the volcanic hills east of Morro Bay, San Luis Obispo County. (Discussion copyrighted by Flora of North America; reprinted with permission.)	Of conservation concern. Arctostaphylos cruzensis is found near the coast in southern Monterey and northern San Luis Obispo counties. 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. 434.	FNA vol. 8, p. 435.
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. 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. 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	P. V. Wells: Four Seasons 9(2): 45. 1992 ,	Roof: Leafl. W. Bot 9: 218. 1962 ,
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 osoensis

Arctostaphylos cruzensis

oso manzanita

Arroyo De La cruz manzanita, La Cruz manzanita

Habit

Shrubs, erect or mound-forming, 1–4 m; burl absent; bark of older stems persistent, gray, shredded, sometimes red, smooth; twigs sparsely short-hairy.

Shrubs, prostrate or mat- or mound-forming, 0.1–1 m; burl absent; twigs sparsely short-hairy to sparsely hairy.

Leaves

petiole to 2 mm;

blade dark green, ± shiny, ovate to orbiculate-ovate, 1.5–3 × 1.5–2.5 cm, base deeply lobed, (clasping), margins entire, plane, surfaces smooth, sparsely short-hairy or glabrous.

petiole to 2 mm;

blade bright green, shiny, oblong-ovate, 1.5–3 × 1–2.5 cm, base auriculate-clasping, margins entire or toothed, plane, (hairy-ciliate proximally), surfaces smooth, finely tomentose, glabrescent.

Inflorescences

racemes, simple or 1-branched;

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

bracts not appressed, leaflike, lanceolate to ovate, 4–8 mm, apex acute, surfaces glabrous.

panicles, 1–3-branched;

immature inflorescence pendent, (branches crowded, bell-shaped, concealed by bracts), axis 0.5–1.5 cm, 1+ mm diam., sparsely short-hairy and hairy;

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

Pedicels

8–9 mm, glabrous.

4–5 mm, sparsely hairy.

Flowers

corolla white, urceolate;

ovary glabrous.

corolla white, urceolate;

ovary densely white-hairy.

Fruits

depressed-globose, 5–8 mm diam., glabrous.

depressed-globose, 8–10 mm diam., glabrous.

Stones

distinct.

= 26.

Arctostaphylos osoensis

Arctostaphylos cruzensis

Phenology

Flowering winter–early spring.

Habitat

Maritime chaparral on volcanic uplands

Maritime chaparral, grasslands on alluvial and fluvial soils

Elevation

0-200 m (0-700 ft)

0-100 m (0-300 ft)

Distribution

[BONAP county map]

Discussion

Of conservation concern.

Arctostaphylos osoensis is found in the volcanic hills east of Morro Bay, San Luis Obispo County.

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

Of conservation concern.

Arctostaphylos cruzensis is found near the coast in southern Monterey and northern San Luis Obispo counties. 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. 434.

FNA vol. 8, p. 435.

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. 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. 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

P. V. Wells: Four Seasons 9(2): 45. 1992 ,

Roof: Leafl. W. Bot 9: 218. 1962 ,

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 osoensis

Arctostaphylos cruzensis

Arctostaphylos osoensis

Arctostaphylos cruzensis