Flora of North America species comparison

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Arctostaphylos pringlei

Arctostaphylos densiflora

Pringle manzanita, yellowleaf manzanita

Vine Hill manzanita
Habit Shrubs, erect, 1–5 m; burl absent; twigs densely short glandular-hairy. Shrubs, erect or mound-forming, ca. 1 m; burl absent; twigs sparsely short-hairy.
Leaves

petiole 5–10 mm;

blade gray-glaucous, dull, elliptic, ovate, or ± orbiculate, 2–5 × 1–4 cm, base rounded, truncate, or ± lobed, margins entire, plane, surfaces papillate, scabrous, finely glandular-hairy.

petiole 4–5 mm;

blade bright green, lustrous, elliptic to narrowly lanceolate-elliptic, 1–2.5 × 0.5–1.5 cm, base cuneate to obtuse, margins entire, plane, surfaces smooth, sparsely puberulent.
Inflorescences

racemes, simple or 1-branched;

immature inflorescence (developing late), pendent or erect, (concealed by bracts), axis 1–1.5 cm, 1+ mm diam., densely short glandular-hairy;

bracts deciduous after flowering, (crowded), appressed, (bright pink), leaflike, lanceolate, 6–10 mm, apex acute, surfaces densely glandular-hairy.

panicles, 3–5-branched;

immature inflorescence pendent, (compact), branches ± spreading, axis 1–1.5 cm, 1+ mm diam., sparsely short-hairy;

bracts not appressed, scalelike, deltate to awl-like, 1.5–3 mm (longer than buds), apex acute, surfaces glabrous.
Pedicels

5–15 mm, finely glandular-hairy.

4–5 mm, glabrous.
Flowers

corolla white to pink, conic to urceolate;

ovary glandular-hairy.

corolla white, urceolate;

ovary glabrous.
Fruits

globose, 6–12 mm diam., finely glandular-hairy, (viscid).

subglobose, 5–6 mm diam., glabrous.
Stones

distinct or connate.

distinct.
2n

= 26.

Arctostaphylos pringlei

Arctostaphylos densiflora
Phenology Flowering winter–early spring.
Habitat Acidic marine sands
Elevation 100 m (300 ft)
Distribution
from FNA
AZ; CA; NV; UT; nw Mexico
[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 densiflora is known only from Vine Hill, Sonoma County. It is the primary source of one of the most widely planted horticultural varieties of the genus (McMinn manzanita). It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stones distinct.
subsp. pringlei
1. Stones connate into single sphere.
subsp. drupacea
Source FNA vol. 8, p. 427. FNA vol. 8, p. 419.
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. pilosula, 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. 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. viridissima, A. viscida
Subordinate taxa
A. pringlei subsp. drupacea, A. pringlei subsp. pringlei
Name authority Parry: Bull. Calif. Acad. Sci. 2: 494. 1887 , M. S. Baker: Leafl. W. Bot. 1: 31. 1932 ,
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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