Flora of North America species comparison

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Arctostaphylos morroensis

Arctostaphylos stanfordiana

Morro manzanita

Stanford's 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 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

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 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, 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.

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

4–6 mm, hairy or glabrous.

5–10 mm, glabrous.
Flowers

corolla white, urceolate;

ovary densely white-hairy.

corolla white to pink, urceolate;

ovary glabrous.
Fruits

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

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

distinct.

distinct.
2n

= 26.

Arctostaphylos morroensis

Arctostaphylos stanfordiana
Phenology Flowering winter–early spring.
Habitat Maritime chaparral on sandy soils near coast
Elevation 0-100 m (0-300 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.)

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. 432. 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. 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. 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 Wieslander & B. Schreiber: Madroño 5: 42, fig. 2a. 1939 , 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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