Flora of North America species comparison

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Arctostaphylos nevadensis

Arctostaphylos pilosula

pine mat manzanita

La Panza manzanita, Santa Margarita manzanita
Habit Shrubs, prostrate or mound-forming, 0.1–0.5 m; burl absent or basal, sometimes epicormic; twigs sparsely short-hairy. Shrubs, erect, 1–5 m; burl absent; twigs short-hairy and hispid.
Leaves

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.

petiole 4–8 mm;

blade dark green to gray-glaucous, dull, narrowly elliptic to orbiculate-ovate, 1–3 × 1–2 cm, base cuneate or truncate to slightly lobed, margins entire, plane, surfaces smooth, glabrous.
Inflorescences

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.

racemes, simple or 1-branched;

immature inflorescence pendent, axis 1–2 cm, 1+ mm diam., short-hairy with long hairs;

bracts not appressed, (green), leaflike, lanceolate, 8–15 mm, apex acute, surfaces long-hairy.
Pedicels

3–5 mm, glabrous.

2–5 mm, glabrous.
Flowers

corolla white, urceolate;

ovary glabrous.

corolla white to pink, urceolate;

ovary glabrous.
Fruits

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

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

distinct.

distinct.
2n

= 26.

Arctostaphylos nevadensis

Arctostaphylos pilosula
Phenology Flowering winter–early spring.
Habitat Chaparral, open forests
Elevation 0-1200 m (0-3900 ft)
Distribution
from FNA
CA; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

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

Of conservation concern.

Arctostaphylos pilosula occurs in San Luis Obispo County and exhibits some variation in leaf shape and color, as well as indument. Plants at higher elevations and farther inland may reflect introgression with A. glauca. Some lower-elevation populations historically have been segregated as subsp. pismoensis or A. wellsii. Field observation suggests that there is a morphological cline between coastal and interior populations so that taxonomic distinctions between these populations are unwarranted. Further taxonomic analysis might help to resolve this situation.

(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. 426.
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. 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. 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. pilosula subsp. pismoensis, A. wellsii
Name authority A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 2: 27. 1878 , Jepson & Wieslander: Erythea 8: 101. 1938 ,
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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