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Rubus bartonianus

Barton's raspberry, bartonberry

arctic blackberry, arctic raspberry, dwarf nagoonberry, nagoonberry

Habit Shrubs, 8–25 dm, unarmed. Herbs, 0.5–3 dm, unarmed.
Stems

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

erect, thin, weak, ± woody basally, glabrous or sparsely hairy, eglandular, not pruinose.

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, simple and usually 3-lobed or ternate;

stipules ovate to lanceolate, 4–8 mm;

blade margins dentate, serrate, or doubly serrate, abaxial surfaces sparsely to moderately pubescent, eglandular.

Inflorescences

1-flowered.

axillary, 1–3-flowered.

Pedicels

moderately hairy, eglandular or sparsely stipitate-glandular.

glabrous or sparsely to moderately pubescent, eglandular or stipitate-glandular.

Flowers

bisexual;

petals white, obovate, (15–)20–25 mm;

filaments filiform;

ovaries glabrous, styles clavate, villous.

bisexual;

petals pink to rose or magenta, obovate to oblanceolate, 8–25 mm;

outer filaments dilated basally, inner filiform;

ovaries glabrous or sparsely hairy, styles filiform.

Fruits

deep red, hemispheric, to 1 cm;

drupelets 10–30, coherent, separating from torus.

reddish to dark purple, globose, to 1 cm diam., rarely larger;

drupelets (10–)15–30, weakly coherent, separating with torus attached.

Rubus bartonianus

Rubus arcticus

Phenology Flowering Mar–May.
Habitat Dry, rocky slopes
Elevation 300–400 m (1000–1300 ft)
Distribution
from FNA
ID; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CO; ME; MI; MN; MT; OR; WA; WY; AB; BC; MB; NT; NU; ON; QC; SK; YT; Eurasia
[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.)

Subspecies 3 (3 in the flora).

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

Key
1. Leaves simple, usually 3-lobed.
subsp. stellatus
1. Leaves usually ternate
→ 2
2. Central leaflets ovate to rhombic, bases rounded to attenuate, not cuneate, apices usually acute; flowers 1–3; petals obovate, apex entire or slightly emarginate.
subsp. arcticus
2. Central leaflets ovate to obovate, bases cuneate, apices usually rounded; flowers solitary; petals oblanceolate to obovate, apex slightly to strongly emarginate.
subsp. acaulis
Source FNA vol. 9, p. 36. FNA vol. 9, p. 35.
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. 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. phoenicolasius, R. pubescens, R. repens, R. saxatilis, R. setosus, R. spectabilis, R. trivialis, R. ulmifolius, R. ursinus, R. vestitus
Subordinate taxa
R. arcticus subsp. acaulis, R. arcticus subsp. arcticus, R. arcticus subsp. stellatus
Name authority M. Peck: Rhodora 36: 267. (1934) Linnaeus: Sp. Pl. 1: 494. (1753)
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