Rubus bartonianus |
Rubus pubescens |
|
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Barton's raspberry, bartonberry |
dwarf raspberry, dwarf red blackberry, dwarf red blackberry or raspberry or red raspberry, dwarf red blackberry raspberry, dwarf red raspberry, five-leaf bramble, red raspberry, ronce pubescente, trailing raspberry |
|
Habit | Shrubs, 8–25 dm, unarmed. | Herbs, to 0.4 dm, unarmed. |
Stems | erect, sparsely short-hairy, glabrescent, eglandular, not pruinose. |
creeping, flowering branches erect, glabrous or sparsely to moderately 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, usually ternate, sometimes pedately 5-foliate; stipules lance-ovate to oblanceolate, (5–)8–12(–20) mm; leaflets 3(–5), petiolule of terminal leaflet 2–7 mm, terminal rhombic to obovate, (2–)4–8(–10) × 2–4(–6) cm, base cuneate, unlobed or 2-lobed, margins deeply serrate to doubly serrate, apex acute or acuminate, abaxial surfaces glabrous or sparsely hairy, eglandular. |
Inflorescences | 1-flowered. |
1–3-flowered, sometimes umbelliform. |
Pedicels | moderately hairy, eglandular or sparsely stipitate-glandular. |
moderately to densely long-hairy, eglandular to densely stipitate-glandular. |
Flowers | bisexual; petals white, obovate, (15–)20–25 mm; filaments filiform; ovaries glabrous, styles clavate, villous. |
bisexual; petals white to pink, oblanceolate to obovate, (4–)6–8(–10) mm; filaments laminar; ovaries glabrous, styles glabrous. |
Fruits | deep red, hemispheric, to 1 cm; drupelets 10–30, coherent, separating from torus. |
red, globose to conical, 0.5–1.4 cm diam., drupelets (5–)10–25, loosely coherent, falling separately or as a unit with torus attached. |
2n | = 14. |
|
Rubus bartonianus |
Rubus pubescens |
|
Phenology | Flowering Mar–May. | Flowering May–Jul. |
Habitat | Dry, rocky slopes | Swamps, bogs, fens, stream banks, moist woods, bluffs, gravel sites, sandy soil |
Elevation | 300–400 m (1000–1300 ft) | 0–2200 m (0–7200 ft) |
Distribution |
ID; OR
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AK; CO; CT; IA; ID; IL; IN; MA; ME; MI; MN; MT; ND; NE; NH; NJ; NY; OH; PA; RI; SD; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; ON; PE; QC; SK; YT; SPM
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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 pubescens is recognized by its creeping, unarmed stems, oblanceolate to lance-ovate stipules, relatively small flowers, and white to pink petals. It hybridizes with R. arcticus subsp. acaulis in areas of sympatry, and the hybrids are referable to R. ×paracaulis L. H. Bailey [= R. pubescens var. paracaulis (L. H. Bailey) B. Boivin]. The hybrids are similar to R. arcticus subsp. acaulis in having more obovate, rounded leaflets, and larger, pink to magenta petals; they are larger, creeping, and have hairy and stipitate-glandular pedicels and sepals like R. pubescens. (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 | ||
Synonyms | R. saxatilis var. canadensis, R. pubescens var. pilosifolius | |
Name authority | M. Peck: Rhodora 36: 267. (1934) | Rafinesque: Med. Repos., hexade 3, 2: 333. (1811) |
Web links |