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Rubus bartonianus

Barton's raspberry, bartonberry

Habit Shrubs, 8–25 dm, unarmed. Shrubs, subshrubs, or herbs, perennial; armed or unarmed.
Stems

erect, sparsely short-hairy, glabrescent, 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.

alternate, imparipinnately or palmately compound or simple;

stipules persistent [deciduous], free or adnate to petiole;

venation pinnate or palmate.

Inflorescences

1-flowered.

Pedicels

moderately hairy, eglandular or sparsely stipitate-glandular.

Flowers

bisexual;

petals white, obovate, (15–)20–25 mm;

filaments filiform;

ovaries glabrous, styles clavate, villous.

perianth and androecium perigynous;

epicalyx bractlets absent;

hypanthium flat to hemispheric;

torus flat or convex to conic;

carpels 5–150, styles apical, distinct;

ovules 2, apical, collateral, only 1 maturing.

Fruits

deep red, hemispheric, to 1 cm;

drupelets 10–30, coherent, separating from torus.

aggregated drupelets;

styles persistent, not elongate.

Rubus bartonianus

Rosaceae tribe Rubeae

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]
North America; Mexico; Central America; South America; West Indies; Eurasia; Africa; Pacific Islands; Australia [Introduced nearly worldwide]
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.)

Genus 1, species 250–700 (37 in the flora).

The base chromosome number for Rubeae is x = 7. The tribe is host to Phragmidium rusts.

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

Source FNA vol. 9, p. 36. FNA vol. 9, p. 27.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus Rosaceae > subfam. Rosoideae
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
Subordinate taxa
Name authority M. Peck: Rhodora 36: 267. (1934) Dumortier: Anal. Fam. Pl., 39. (1829)
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