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summer holly

mock arbute or arbutus, summer-blooming-manzanita, summer-holly

Habit Shrubs or trees, burled, (capable of sprouting after fire); bark gray to reddish, peeling to shredding [flaking, exfoliating, sometimes in patches]. Shrubs or trees, to 6(–9) m, capable of stump-sprouting; lignotuber sometimes present, to 1.3 m diam.
Stems

usually erect to spreading, rarely trailing or mat-forming, branching, glabrous or densely hairy.

Leaves

persistent [rarely facultatively drought-deciduous], bifacial;

blade narrowly ovate to ovate or elliptic to obovate or broadly ovate, coriaceous, margins usually serrate to serrulate, rarely subentire, plane or revolute, abaxial surface usually densely gray-tomentose, rarely subglabrous, adaxial (green, shining), usually glabrous, sometimes hairy along midvein.

horizontally oriented;

petiole 0.2–2 cm, gray-tomentose;

blade 3–12.8 × 1–4.2 cm (to 14.9 × 8.1 cm on sucker shoots), base tapering to cuneate, apex obtuse to acute;

venation pinnate.

Inflorescences

racemes [panicles], solitary or clustered, 5–30-flowered.

3.5–14 cm, usually gray-tomentose, rarely with stalked, swollen-headed, glandular hairs;

floral bracts solitary at bases of pedicels, lanceolate-linear or lanceolate-ovate to oblong-ovate, plane to navicular, 2–10 mm.

Pedicels

often curved, 4–20 mm;

bracteoles usually basal, rarely higher, often reduced, acicular to narrowly triangular, to 3 mm.

Flowers

bisexual;

sepals (drying) persistent, (4–)5, distinct or slightly connate, narrowly triangular to subulate or nearly acicular;

petals (4–)5, (imbricate), connate for 3/4+ their lengths, white [greenish white, pale yellow, pink, or red], corolla cylindric to nearly globose;

stamens 10, included;

filaments dilated near base;

anthers with 2 dorsal awns, dehiscent by 2 slits 1/4–1/2 as long as anthers;

ovary 5-locular, (papillate);

stigma slightly capitate.

sepals appressed to corollas during flowering, becoming spreading to reflexed in fruit, equal or nearly so, much shorter than corolla tube, 2–3.5 × 0.8–1.7 mm, apex acute to acuminate, gray-tomentose, rarely with glandular hairs;

petals spreading or recurved, corolla 5–8 × 3.5–5.5 mm, glabrous or puberulent, lobes obtuse, 0.9–1.3 × 1.4–1.8 mm;

nectary weakly 10-lobed or -ribbed;

stamens 2.6–3.6 mm;

filaments 2.3–3.4 mm, villous;

anthers ovoid, 1–1.6 mm, awns 0.6–1.1 mm;

ovary villous;

style often persistent, included or slightly exserted, 3–5.3 mm, glabrous or hairy;

stigma minute.

Drupes

red [nearly black to dark purple], globose, juicy, warty, granular, or papillate (with multicellular papillae radiating ± perpendicularly outward);

pyrenes 5, connate into solid, thick-walled, stonelike, globose endocarp.

5–7 mm diam.

Seeds

5, connate.

pendulous by persistent, gray, short, caplike funiculus, 2.2–2.3 × 1–1.4 mm;

testa thick-walled, reticulate.

Young

twigs gray-tomentose.

x

= 13.

2n

= 26.

Comarostaphylis

Comarostaphylis diversifolia

Distribution
from FNA
CA; Mexico; Central America
[BONAP county map]
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Arctostaphylos Adanson sect. Comarostaphylis (Zuccarini) A. Gray; Arctostaphylos subg. Comarostaphylis (Zuccarini) A. Gray

Species 10 (1 in the flora).

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

Subspecies 2 (2 in the flora).

Comarostaphylis diversifolia is sometimes cultivated and is the only species in the genus commonly used horticulturally. H. E. McMinn (1949), P. A. Munz (1950), and M. G. Schmidt (1980) gave detailed discussions of horticultural considerations. It tolerates full sun and clay soil, and is suitable for bird and butterfly gardens. Subspecies discolor has been used medicinally (for insomnia) and its fruit is considered edible by some. P. C. Standley (1920–1926) stated that the fruits or leaves have narcotic properties: children apparently have been poisoned by the fruit, and the plant has been used for inducing sleep or as a purgative.

This species is the most distinctive member of the genus, easily recognized by the unique red fruits (nearly black to dark purple in all other species), the narrow sepals, and the usually gray-tomentose inflorescences. It is also unique in range, being geographically isolated from the rest of the genus, and in elevation, being the only species found below ca. 1350 meters. The two allopatric subspecies differ primarily in leaf and inflorescence morphology.

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

Key
1. Leaf margins usually strongly revolute; inflorescences 3.5-8 cm; Orange and San Diego counties, California; n Baja California.
subsp. diversifolia
1. Leaf margins usually plane; inflorescences 6-14 cm; Los Angeles and Santa Barbara counties, California.
subsp. planifolia
Source FNA vol. 8, p. 401. Author: George M. Diggs Jr.. FNA vol. 8, p. 401.
Parent taxa Ericaceae > subfam. Arbutoideae Ericaceae > subfam. Arbutoideae > Comarostaphylis
Subordinate taxa
C. diversifolia
C. diversifolia subsp. diversifolia, C. diversifolia subsp. planifolia
Synonyms Arctostaphylos arguta var. diversifolia, Arctostaphylos diversifolia
Name authority Zuccarini: Abh. Math.-Phys. Cl. Königl. Bayer. Akad. Wiss. 2: 331. 1837 , (Parry) Greene: Bull. Calif. Acad. Sci. 2: 406. 1887 ,
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