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Rubus bartonianus

Barton's raspberry, bartonberry

strawberry raspberry

Habit Shrubs, 8–25 dm, unarmed. Shrubs, 5–10(–15) dm, armed.
Stems

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

annual, arching to mounding, glabrous, eglandular, not pruinose;

prickles sparse, slightly hooked, stout, 3–4 mm, broad-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, pinnately compound;

stipules lanceolate to oblanceolate, 8–13 mm;

leaflets (3–)5–7, terminal lanceolate to narrowly ovate, (5.5–)6.2–8.5(–9.7) × (1.8–)2.2–3(–4.2) cm, base usually rounded, sometimes truncate to subcordate, unlobed, margins finely to coarsely doubly serrate, apex acuminate, abaxial surfaces with prickles on midvein, glabrous, eglandular.

Inflorescences

1-flowered.

solitary flowers or 2–3-flowered clusters.

Pedicels

moderately hairy, eglandular or sparsely stipitate-glandular.

prickles sparse, slightly hooked, glabrous, eglandular.

Flowers

bisexual;

petals white, obovate, (15–)20–25 mm;

filaments filiform;

ovaries glabrous, styles clavate, villous.

bisexual;

petals white, broadly obovate to suborbiculate, 12–15(–18) mm;

filaments laminar;

ovaries glabrous, styles glabrous.

Fruits

deep red, hemispheric, to 1 cm;

drupelets 10–30, coherent, separating from torus.

red, oblong, 1.4–2 cm;

drupelets 50–100, strongly coherent, separating from torus.

2n

= 14.

Rubus bartonianus

Rubus illecebrosus

Phenology Flowering Mar–May. Flowering Jun–Sep.
Habitat Dry, rocky slopes Disturbed sites
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
CT; KY; MA; ME; MN; NC; NY; OR; PA; VA; WV; NS; ON; e Asia [Introduced in North America; introduced also in South America (Colombia, Paraguay, Venezuela)]
[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 illecebrosus is distinguished from other raspberries by its prickly, glabrous, eglandular stems, pinnately compound leaves with typically seven lanceolate to narrowly ovate leaflets, relatively large flowers, white petals, and 50–100 drupelets.

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

Source FNA vol. 9, p. 36. FNA vol. 9, p. 43.
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. 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
Name authority M. Peck: Rhodora 36: 267. (1934) Focke: Abh. Naturwiss. Vereine Bremen 16: 278. (1899)
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