Rubus bartonianus |
Rubus saxatilis |
|
---|---|---|
Barton's raspberry, bartonberry |
stone bramble |
|
Habit | Shrubs, 8–25 dm, unarmed. | Herbs or subshrubs, to 4 dm, armed or unarmed. |
Stems | erect, sparsely short-hairy, glabrescent, eglandular, not pruinose. |
usually creeping, ± woody basally, sparsely to densely hairy, eglandular, not pruinose; prickles absent or sparse, erect, weak, 1–3 mm, narrow-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; stipules free from petioles, lanceolate to ovate or elliptic, 6–11 mm; petiole 2–11 cm; petiolule of terminal leaflet 8–20 mm; lateral leaflet sessile or subsessile; terminal leaflets ovate to elliptic, 4–8 × 3–7 cm, base tapered, unlobed, lateral leaflets sometimes shallowly lobed, margins coarsely doubly serrate, apex acute, abaxial surfaces unarmed, sparsely hairy, eglandular. |
Inflorescences | 1-flowered. |
axillary, 1–6-flowered, cymiform or umbelliform. |
Pedicels | moderately hairy, eglandular or sparsely stipitate-glandular. |
unarmed or prickles weak, erect, hairy, eglandular or sparsely stipitate-glandular. |
Flowers | bisexual; petals white, obovate, (15–)20–25 mm; filaments filiform; ovaries glabrous, styles clavate, villous. |
bisexual; petals greenish white, narrowly obovate, 5.5–7 mm; filaments laminar; ovaries glabrous. |
Fruits | deep red, hemispheric, to 1 cm; drupelets 10–30, coherent, separating from torus. |
red, globose, 0.5–1.5 cm; drupelets 1–10, not or weakly coherent, separating with torus attached. |
2n | = 28. |
|
Rubus bartonianus |
Rubus saxatilis |
|
Phenology | Flowering Mar–May. | Flowering May–Jul. |
Habitat | Dry, rocky slopes | Birch scrub, talus slopes |
Elevation | 300–400 m (1000–1300 ft) | 1300–2100 m (4300–6900 ft) |
Distribution |
ID; OR
|
Greenland; Eurasia |
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 saxatilis is defined by its creeping, unarmed or weakly armed stems, ternate leaves, and relatively small white petals. It has very weak prickles that detach easily, sometimes giving plants an unarmed appearance. The species is known in the flora area from only two sites in southern Greenland (T. W. Böcher 1938; D. B. Jensen and K. D. Christensen 2003). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 36. | FNA vol. 9, p. 52. |
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus | Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus |
Sibling taxa | ||
Name authority | M. Peck: Rhodora 36: 267. (1934) | Linnaeus: Sp. Pl. 1: 494. (1753) |
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