Flora of North America species comparison

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Arctostaphylos morroensis

Arctostaphylos silvicola

Morro manzanita

Bonny Doon manzanita, silverleaf manzanita
Habit Shrubs, erect or mound-forming, 1–4 m; burl absent; bark on older stems persistent, gray, shredded; twigs short-hairy with long, white hairs. Shrubs, erect, 1–3 m; burl absent; twigs sparsely to densely soft-hairy.
Leaves

bifacial in stomatal distribution;

petiole 2–5 mm;

blade dull gray abaxially, dark green, ± shiny adaxially, oblong-ovate to oblong-elliptic, 1.5–3 × 1–2 cm, base subcordate to ± truncate (sometimes with vestigial auricles), margins entire, cupped, abaxial surface smooth, densely tomentose, adaxial surface smooth, glabrous.

petiole 3–8 mm;

blade gray, glaucous, dull, narrowly obovate or oblong-elliptic, 1.5–3.5 × 1–1.5 cm, base cuneate, margins entire, plane, surfaces smooth, appressed gray-canescent, glabrescent.
Inflorescences

panicles, 2–5-branched;

immature inflorescence pendent, (branches congested, bell-shaped, partly framed by bracts), axis 0.5–0.8 cm, 1+ mm diam., short-hairy with long, white hairs;

bracts not appressed, leaflike, linear-lanceolate, 5–8 mm, apex acuminate, surfaces puberulent.

racemelike, simple or 1–2-branched;

immature inflorescence pendent, (branches bell-shaped, framed by bracts), axis 0.5–1 cm, 1+ mm diam., sparsely to densely soft-hairy;

bracts not appressed, leaflike, lanceolate, 5–12 mm, apex acute to obtuse, surfaces canescent or glabrous.
Pedicels

4–6 mm, hairy or glabrous.

5–7 mm, usually glabrous, sometimes sparsely hairy.
Flowers

corolla white, urceolate;

ovary densely white-hairy.

corolla white, conic to urceolate;

ovary glabrous.
Fruits

depressed-globose, 7–10 mm diam., sparsely hairy.

globose, 6–12 mm diam., glabrous.
Stones

distinct.

distinct.
2n

= 26.

= 26.

Arctostaphylos morroensis

Arctostaphylos silvicola
Phenology Flowering winter–early spring. Flowering winter–early spring.
Habitat Maritime chaparral on sandy soils near coast Chaparral, open conifer forests
Elevation 0-100 m (0-300 ft) 100-500 m (300-1600 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Arctostaphylos morroensis is known from the Morro Bay region in San Luis Obispo County.

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

Of conservation concern.

Arctostaphylos silvicola is known from deep, sandy soils near the coast in chaparral and open conifer forests of the central Santa Cruz Mountains, Santa Cruz County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 432. FNA vol. 8, p. 430.
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. 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. stanfordiana, A. tomentosa, A. uva-ursi, A. virgata, A. viridissima, A. viscida
Name authority Wieslander & B. Schreiber: Madroño 5: 42, fig. 2a. 1939 , 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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