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Rubus bartonianus

Barton's raspberry, bartonberry

Japanese wineberry, wine raspberry, wineberry

Habit Shrubs, 8–25 dm, unarmed. Shrubs, 10–20(–30) dm, armed.
Stems

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

biennial, arching, sparsely to moderately hairy, long-stipitate-glandular, not pruinose;

prickles sparse to dense, erect to hooked, slender, 2–8(–10) mm, slender-based;

bristles dense, 2–6 mm, usually gland-tipped and reddish purple, glands ellipsoid to narrowly cup-shaped.

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, 5–12 mm;

terminal leaflets broadly deltate or ovate to suborbiculate, 4–15 × 3.5–14 cm, base truncate, rounded, or shallowly cordate, unlobed or dentate to shallowly, sharply or bluntly 3-lobed, margins coarsely serrate or doubly serrate, apex acute to acuminate, abaxial surfaces with scattered, erect to curved prickles on moderate- to large-sized veins, densely white-hairy, moderately to densely long-stipitate-glandular along veins.

Inflorescences

1-flowered.

terminal and axillary, 5–30-flowered, cymiform to racemiform.

Pedicels

moderately hairy, eglandular or sparsely stipitate-glandular.

usually unarmed or prickles sparse, erect, moderately to densely hairy, densely long-stipitate-glandular.

Flowers

bisexual;

petals white, obovate, (15–)20–25 mm;

filaments filiform;

ovaries glabrous, styles clavate, villous.

bisexual;

petals white to pink, ovate to suborbiculate, 4–6 mm;

filaments laminar;

ovaries glabrous.

Fruits

deep red, hemispheric, to 1 cm;

drupelets 10–30, coherent, separating from torus.

red to maroon, globose, 1–1.5 cm;

drupelets 15–40, strongly coherent, separating from torus.

2n

= 14.

Rubus bartonianus

Rubus phoenicolasius

Phenology Flowering Mar–May. Flowering May–Jul.
Habitat Dry, rocky slopes Woodlands, roadsides, disturbed open areas, moist soil
Elevation 300–400 m [1000–1300 ft] 0–1200 m [0–3900 ft]
Distribution
from FNA
ID; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CT; DC; DE; GA; IL; IN; KY; MA; MD; MO; NC; NJ; NY; OH; PA; RI; SC; TN; VA; VT; WV; BC; e Asia (China, Japan, Korea) [Introduced in North America]
[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 phoenicolasius was introduced to North America for edible fruit, breeding stock, and for ornament. Attractive for its typically reddish purple glandular hairs, R. phoenicolasius nonetheless can be invasive.

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

Source FNA vol. 9, p. 36. FNA vol. 9, p. 51.
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. 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. pubescens, R. repens, R. saxatilis, R. setosus, R. spectabilis, R. trivialis, R. ulmifolius, R. ursinus, R. vestitus
Name authority M. Peck: Rhodora 36: 267. (1934) Maximowicz: Bull. Acad. Imp. Sci. Saint-Pétersbourg 17: 160. (1872)
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