Flora of North America species comparison

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Arctostaphylos montereyensis

Arctostaphylos stanfordiana

Monterey manzanita, toro manzanita

Stanford's manzanita
Habit Shrubs, erect, 1–3 m; burl absent; twigs finely glandular-hairy. Shrubs, erect or prostrate to decumbent, mat- or mound-forming, 0.1–3 m; burl absent; twigs usually glabrous, sometimes sparsely short-hairy, hairs sometimes glandular.
Leaves

petiole 4–6 mm;

blade light green, reddish, or slightly glaucous, dull, orbiculate-ovate to orbiculate, 2–3 × 1.5–3 cm, base rounded, truncate, or slightly lobed, margins entire, plane, surfaces papillate, scabrous, finely glandular-hairy.

petiole 4–12 mm;

blade bright green, shiny or slightly glaucous, elliptic, oblong, or oblanceolate, 3–5 × 1.5–2.5 cm, base cuneate, (not clasping), margins entire, plane, surfaces smooth, glabrous or, rarely, finely glandular-puberulent.
Inflorescences

panicles, 4–10-branched;

immature inflorescence pendent, branches crowded, axis 1–2 cm, 1+ mm diam., densely glandular-hairy;

bracts not appressed, (green), leaflike, lanceolate, 3–12 mm, apex acuminate, surfaces glandular-hairy.

panicles, 3–5-branched;

immature inflorescence ascendent, branches wide-spreading, often ascending to erect, axis 2–2.5 cm, to 1 mm diam., usually glabrous, sparsely hairy, or sometimes sparsely glandular-hairy;

bracts tightly appressed, scalelike, ovate to deltate, 1–1.5 mm (± equaling buds), apex acuminate, surfaces usually sparsely hairy or sometimes sparsely glandular-hairy; (buds scattered along inflorescence axis, round, appearing as “beads”).
Pedicels

5–6 mm, finely glandular-hairy.

5–10 mm, glabrous.
Flowers

corolla white, urceolate;

ovary glandular-hairy.

corolla white to pink, urceolate;

ovary glabrous.
Fruits

depressed-globose, 8–12 mm diam., finely glandular-hairy, (viscid).

subglobose, 6–8 mm diam., glabrous.
Stones

distinct or partially connate.

distinct.
2n

= 26.

Arctostaphylos montereyensis

Arctostaphylos stanfordiana
Phenology Flowering winter–early spring.
Habitat Maritime chaparral
Elevation 0-500 m (0-1600 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Arctostaphylos montereyensis is known from sandy soils, ranging from dunes to sandstone outcrops, in the southern Monterey Bay area, Monterey County. Plants found on Fort Ord with auriculate leaf bases and blue-green leaves may represent hybrids with A. pajaroensis.

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

Subspecies 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Twigs, inflorescence axes, and bracts short glandular-hairy.
subsp. raichei
1. Twigs, inflorescence axes, and bracts glabrous or sparsely short-hairy
→ 2
2. Plants erect, 1-3 m; interior n Coast Ranges
subsp. stanfordiana
2. Plants prostrate to decumbent, 0.1-1 m; Sonoma County.
subsp. decumbens
Source FNA vol. 8, p. 426. FNA vol. 8.
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. 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. tomentosa, A. uva-ursi, A. virgata, A. viridissima, A. viscida
Subordinate taxa
A. stanfordiana subsp. decumbens, A. stanfordiana subsp. raichei, A. stanfordiana subsp. stanfordiana
Name authority Hoover: Leafl. W. Bot. 10: 87. 1964 , Parry: Bull. Calif. Acad. Sci. 2: 493. 1887 ,
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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