The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links
Rubus bartonianus

Barton's raspberry, bartonberry

black raspberry, framboisier noir

Habit Shrubs, 8–25 dm, unarmed. Shrubs, 5–25 dm, armed.
Stems

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

biennial, erect, primocanes and floricanes later over-arching, glabrous or sparsely puberulent, eglandular, strongly pruinose;

prickles sometimes sparse, erect or hooked, narrow to stout, 4–8 mm, narrow- to 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, ternate or palmately compound;

stipules filiform, 5–10 mm;

petiole usually armed with prickles;

petiolules of terminal leaflets also sometimes armed;

lateral leaflets sessile or subsessile;

leaflets 3(–5), terminal ovate to lanceolate, 5–14 × 3–11 cm, base rounded to cordate, unlobed or laterals sometimes lobed, margins finely to doubly serrate, apex acute, abaxial surfaces sometimes with hooked prickles on midveins, densely white-canescent to tomentose, eglandular.

Inflorescences

1-flowered.

(2–)3–7(–20)-flowered, cymiform or umbelliform.

Pedicels

moderately hairy, eglandular or sparsely stipitate-glandular.

prickles erect, hooked, puberulent to pubescent, eglandular.

Flowers

bisexual;

petals white, obovate, (15–)20–25 mm;

filaments filiform;

ovaries glabrous, styles clavate, villous.

bisexual;

petals initially erect, later ascending, white, narrowly obovate to elliptic, 5–10 mm, apex sometimes emarginate;

filaments laminar;

ovaries tomentose.

Fruits

deep red, hemispheric, to 1 cm;

drupelets 10–30, coherent, separating from torus.

usually dark purplish to black, rarely amber, pruinose, aromatic, depressed-globose, 1–1.5 cm;

drupelets 20–50, coherent, separating from torus.

2n

= 14.

Rubus bartonianus

Rubus occidentalis

Phenology Flowering Mar–May. Flowering late Apr–Jul.
Habitat Dry, rocky slopes Woodlands, fields, prairies, meadows, savannas, in disturbed areas, dry to moist soil
Elevation 300–400 m [1000–1300 ft] 0–1000 m [0–3300 ft]
Distribution
from FNA
ID; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CO; CT; DC; DE; GA; IA; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; VA; VT; WI; WV; NB; ON; QC
[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 occidentalis is the source of most of the black raspberries in cultivation. See 13b. R. idaeus subsp. strigosus for discussion of application of the name R. neglectus. Also, see 17. R. leucodermis for a discussion of its taxonomic closeness. The morphologically similar species R. eriocarpus Liebmann is known from southern Mexico and Central America, and R. pringlei Rydberg is known from Mexico and Guatemala.

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

Source FNA vol. 9, p. 36. FNA vol. 9, p. 46.
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. 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) Linnaeus: Sp. Pl. 1: 493. (1753)
Web links