Flora of North America species comparison

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Arctostaphylos imbricata

Arctostaphylos nevadensis

San Bruno Mountain manzanita

pine mat manzanita
Habit Shrubs, prostrate or mat- or mound-forming, 0.1–1 m; burl absent; twigs densely fine-hairy with long, gland-tipped hairs. Shrubs, prostrate or mound-forming, 0.1–0.5 m; burl absent or basal, sometimes epicormic; twigs sparsely short-hairy.
Leaves

petiole to 2 mm;

blade light green, dull, orbiculate to orbiculate-ovate, 2.5–4 × 2–3 cm, base auriculate-clasping, margins entire, plane, surfaces papillate, ± scabrous, sparsely glandular-hairy.

petiole 3–7 mm;

blade bright green, shiny, obovate or oblanceolate, 1–3 × 1–1.5 cm, base cuneate, margins entire, plane, surfaces smooth, puberulent, glabrescent.
Inflorescences

panicles, 3–5-branched;

immature inflorescence pendent, (branches densely clustered, ± sessile), axis 0.5–1 cm, 1+ mm diam., densely fine-hairy with long, gland-tipped hairs;

bracts appressed, leaflike, ovate, 5–10 mm, apex acute, surfaces glandular-hairy.

racemes, simple or 1-branched;

immature inflorescence pendent, (branches congested, globose), axis 0.5–1 cm, 1+ mm diam., sparsely short-hairy;

bracts not appressed, (green), scalelike, linear or linear-lanceolate, mostly 2–3 mm (some near base leaflike, 5–10 mm), apex acuminate, mucronate, surfaces glabrous or sparsely hairy, rarely finely glandular-hairy.
Pedicels

3–5 mm, densely glandular-hairy.

3–5 mm, glabrous.
Flowers

corolla white, urceolate;

ovary densely glandular-hairy.

corolla white, urceolate;

ovary glabrous.
Fruits

depressed-globose, 6–7 mm diam., glandular-hairy, (± viscid).

(dark brown), globose, 6–8 mm diam., glabrous.
Stones

distinct.

distinct.
2n

= 26.

Arctostaphylos imbricata

Arctostaphylos nevadensis
Phenology Flowering winter–early spring.
Habitat Maritime chaparral on sandstone outcroppings
Elevation 100-200 m (300-700 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Arctostaphylos imbricata occurs on San Bruno Mountain in San Mateo County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

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

Subspecies 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Burls absent; plants killed by fire.
subsp. nevadensis
1. Burls basal or epicormic; plants resprouting after fire.
subsp. knightii
Source FNA vol. 8, p. 435. 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. 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. 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. 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
Subordinate taxa
A. nevadensis subsp. knightii, A. nevadensis subsp. nevadensis
Synonyms A. andersonii var. imbricata
Name authority Eastwood: Proc. Calif. Acad. Sci., ser. 4, 20: 149. 1931 , A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 2: 27. 1878 ,
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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