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Rubus bartonianus

Barton's raspberry, bartonberry

Cuyamaca raspberry, San Diego raspberry, wax leaf raspberry

Habit Shrubs, 8–25 dm, unarmed. Shrubs, to 3 dm, weakly armed.
Stems

erect, sparsely short-hairy, glabrescent, eglandular, not pruinose.

biennial, creeping, glabrous, eglandular, strongly pruinose;

prickles sparse, erect or slightly curved, weak, slender, 2–3 mm, narrow-based.

Leaves

deciduous, simple;

stipules lanceolate, 4–6 mm;

blade cordate to broadly ovate, (2–)2.5–4(–5) × (2.5–)3.5–4.5(–5.5) cm, base deeply cordate, 3–5-lobed, lobe apices acute to obtuse, margins coarsely doubly dentate, abaxial surfaces glabrous or sparsely hairy, eglandular or sparsely stipitate-glandular.

deciduous, ternate;

stipules filiform to linear, 3–10 mm;

terminal leaflets ovate to elliptic, 4–8 × 3–7 cm, base tapered or subcordate, often 2-lobed, margins coarsely dentate, apex acute to rounded, abaxial surfaces unarmed, densely white-tomentose, eglandular.

Inflorescences

1-flowered.

terminal and axillary, (1–)2–4(–10)-flowered, cymiform.

Pedicels

moderately hairy, eglandular or sparsely stipitate-glandular.

unarmed, finely hairy, stipitate-glandular.

Flowers

bisexual;

petals white, obovate, (15–)20–25 mm;

filaments filiform;

ovaries glabrous, styles clavate, villous.

bisexual;

petals white, oblong to oblanceolate, 4–8 mm;

filaments laminar;

ovaries white-tomentose.

Fruits

deep red, hemispheric, to 1 cm;

drupelets 10–30, coherent, separating from torus.

reddish purple, hemispheric to conic, 0.4–1 cm diam.;

drupelets 10–40, coherent, separating from torus.

Rubus bartonianus

Rubus glaucifolius

Phenology Flowering Mar–May. Flowering Apr–Jul.
Habitat Dry, rocky slopes Semiopen montane forests
Elevation 300–400 m [1000–1300 ft] 800–2100 m [2600–6900 ft]
Distribution
from FNA
ID; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Rubus bartonianus is distinguished from the other flowering raspberries within its geographic range by its erect, unarmed stems, relatively small, simple leaves with acute to obtuse lobes, deeply cordate bases, sparsely hairy or glabrous abaxial surfaces, relatively large flowers with white petals, and densely long-hairy, clavate styles. The leaves superficially resemble those of Acer glabrum or some species of Ribes.

Rubus bartonianus is most similar to R. neomexicanus but especially R. deliciosus. The species is known only from the Snake River Canyon of Idaho and Oregon.

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

Rubus glaucifolius is found in the Sierra Nevada and Klamath mountains as well as the Peninsular and northern Coastal ranges in California, and in adjacent Oregon only in Jackson County.

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

Source FNA vol. 9, p. 36. FNA vol. 9, p. 41.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus
Sibling taxa
R. allegheniensis, R. arcticus, R. bifrons, R. caesius, R. canadensis, R. chamaemorus, R. cuneifolius, R. deliciosus, R. flagellaris, R. glaucifolius, R. hispidus, R. idaeus, R. illecebrosus, R. laciniatus, R. lasiococcus, R. leucodermis, R. neomexicanus, R. nivalis, R. niveus, R. nutkanus, R. occidentalis, R. odoratus, R. parviflorus, R. parvifolius, R. pascuus, R. pedatus, R. pensilvanicus, R. phoenicolasius, R. pubescens, R. repens, R. saxatilis, R. setosus, R. spectabilis, R. trivialis, R. ulmifolius, R. ursinus, R. vestitus
R. allegheniensis, R. arcticus, R. bartonianus, R. bifrons, R. caesius, R. canadensis, R. chamaemorus, R. cuneifolius, R. deliciosus, R. flagellaris, R. hispidus, R. idaeus, R. illecebrosus, R. laciniatus, R. lasiococcus, R. leucodermis, R. neomexicanus, R. nivalis, R. niveus, R. nutkanus, R. occidentalis, R. odoratus, R. parviflorus, R. parvifolius, R. pascuus, R. pedatus, R. pensilvanicus, R. phoenicolasius, R. pubescens, R. repens, R. saxatilis, R. setosus, R. spectabilis, R. trivialis, R. ulmifolius, R. ursinus, R. vestitus
Synonyms R. ganderi, R. glaucifolius subsp. ganderi, R. glaucifolius var. ganderi, R. leucodermis var. glaucifolius
Name authority M. Peck: Rhodora 36: 267. (1934) Kellogg: Proc. Calif. Acad. Sci. 1(ed. 2): 70. (1873)
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