Flora of North America species comparison

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Arctostaphylos pilosula

Arctostaphylos myrtifolia

La Panza manzanita, Santa Margarita manzanita

Ione manzanita
Habit Shrubs, erect, 1–5 m; burl absent; twigs short-hairy and hispid. Shrubs, erect or mound-forming, 0.5–1.5 m; burl absent; bark on older stems persistent, dark red with translucent, grayish patches, smooth; twigs finely glandular-hairy.
Leaves

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.

erect;

petiole 1–3 mm;

blade bright green, shiny, narrowly elliptic, 0.6–1.5 × 0.3–0.8 cm, base cuneate, margins entire, plane, surfaces rough, papillate, sparsely finely glandular-hairy.
Inflorescences

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.

racemes, simple or 1-branched;

immature inflorescence pendent, axis 0.5–1 cm, 1+ mm diam., finely glandular-hairy;

bracts not appressed, scalelike, deltate, 1–2 mm, apex acuminate, surfaces glabrous.
Pedicels

2–5 mm, glabrous.

1–3 mm, glabrous.
Flowers

corolla white to pink, urceolate;

ovary glabrous.

corolla white, urceolate;

ovary white-hairy.
Fruits

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

subcylindric, 3–4 mm diam., glabrous.
Stones

distinct.

distinct, (breaking apart when mature).
2n

= 26.

= 26.

Arctostaphylos pilosula

Arctostaphylos myrtifolia
Phenology Flowering winter–early spring. Flowering winter–early spring.
Habitat Chaparral, open forests Exposed acidic, whitish, clay soils (oxisols)
Elevation 0-1200 m (0-3900 ft) 30-200 m (100-700 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)

Of conservation concern.

Arctostaphylos myrtifolia is known only from the lower Sierra Nevada foothills near Ione in the eastern part of the Central Valley.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 426. FNA vol. 8, p. 415.
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. 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
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. 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
Synonyms A. pilosula subsp. pismoensis, A. wellsii
Name authority Jepson & Wieslander: Erythea 8: 101. 1938 , Parry: Pittonia 1: 34. 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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