Flora of North America species comparison

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Arctostaphylos hispidula

Arctostaphylos viridissima

Gasquet manzanita, Howell's manzanita

Mcminn's manzanita, white-hair manzanita
Habit Shrubs, erect or mound-forming, 1–3 m; burl absent; twigs finely glandular-hairy. Shrubs, erect, 1–4 m; burl absent; twigs short-hairy with longer, white hairs.
Leaves

petiole 3–6 mm;

blade dark green, dull, elliptic to oblanceolate, 1–3 × 0.5–1.5 cm, base cuneate, margins entire, plane, surfaces scabrous, papillate, finely glandular-hairy.

petiole 1–4 mm;

blade dark green, shiny, narrowly ovate to oblong-ovate, 2–3.5 × 1.5–2.5 cm, base truncate to ± auriculate-clasping, margins entire, plane, surfaces smooth, puberulent, glabrescent.
Inflorescences

panicles, 3–6-branched;

immature inflorescence pendent, branches spreading or ascending to erect, axis 1–2 cm, to 1 mm diam., finely glandular-hairy;

bracts tightly appressed, scalelike, awl-like, 2–4 mm (equaling buds), apex acuminate, surfaces finely glandular-hairy; (buds scattered along inflorescence axis, round, appearing as “beads”).

racemes, simple or 1-branched;

immature inflorescence pendent, (branches ± concealed by bracts), axis 1–1.5 cm, 1+ mm diam., short-hairy with long, white hairs;

bracts not appressed, (crowded), leaflike, lanceolate, 6–10 mm, apex acute, surfaces lightly hairy.
Pedicels

3–5 mm, glabrous.

2–3 mm, sparsely hairy.
Flowers

corolla white, urceolate;

ovary glabrous.

corolla white, conic to urceolate;

ovary densely white-hairy.
Fruits

subglobose, 5–7 mm diam., glabrous.

subglobose, 10–15 mm diam., sparsely hairy or glabrous.
Stones

distinct.

distinct.
2n

= 26.

= 26.

Arctostaphylos hispidula

Arctostaphylos viridissima
Phenology Flowering winter–early spring. Flowering winter–early spring.
Habitat Serpentine chaparral and open forests on sandstone Island chaparral, open forests
Elevation 100-1100 m (300-3600 ft) 100-600 m (300-2000 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Arctostaphylos hispidula is known from Josephine County, Oregon, and adjacent California in Del Norte and Humboldt counties; there is an isolated population in northern Sonoma County, California.

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

Of conservation concern.

Arctostaphylos viridissima is known from siliceous shale on the eastern part of Santa Cruz Island.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 420. FNA vol. 8, p. 433.
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. 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
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. stanfordiana, A. tomentosa, A. uva-ursi, A. virgata, A. viscida
Synonyms A. stanfordiana subsp. hispidula A. pechoensis var. viridissima
Name authority Howell: Fl. N.W. Amer., 415. 1901 , (Eastwood) McMinn: Man. Calif. Shrubs, 419. 1939 ,
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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