Rubus deliciosus |
Rubus leucodermis |
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boulder raspberry, delicious raspberry |
black raspberry, blackcap, blackcap raspberry, dark raspberry, dwarf bramble, western black raspberry, white-bark raspberry |
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Habit | Shrubs, 5–15(–20) dm, unarmed. | Shrubs, 10–30 dm, armed. | ||||
Stems | decumbent to erect, glabrous or sparsely short-hairy, eglandular or sparsely stipitate-glandular, not pruinose. |
biennial, ascending, often arching, glabrous or sparsely puberulent, eglandular or sparsely to densely short-stipitate-glandular, strongly pruinose; prickles moderate to dense, erect or curved, slender to stout, 4–8 mm, usually broad-based, sometimes narrow-based. |
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Leaves | deciduous, simple; stipules lanceolate to narrowly ovate, 5–8(–14) mm; blade orbiculate to reniform, (1.5–)2–4(–5) × (2.5–)3–4.5(–7) cm, base shallowly cordate, 3–5(–7)-lobed, lobe apices broadly rounded to obtuse, margins doubly dentate, abaxial surfaces sparsely hairy, mostly along veins, sparsely stipitate-glandular. |
deciduous, palmately compound or ternate; stipules filiform, 5–10 mm; petiole with hooked or erect prickles, glabrous, eglandular or sparsely to densely sessile- to short-stipitate-glandular; lateral leaflets stalked, at least 2 larger ones, often with prickles, glabrous, eglandular or stipitate-glandular; leaflets 3–5(–7), terminal ovate to lanceolate, 6–10 × 3–6 cm, base cordate to truncate, unlobed or shallowly 3-lobed, margins serrate to doubly serrate, apex acuminate, abaxial surface sometimes with prickles on midrib and some lateral veins, glabrous to strongly white-tomentose, usually eglandular. |
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Inflorescences | 1-flowered. |
axillary and terminal, (1–)3–10(–12)-flowered, flat-topped cymiform or umbelliform. |
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Pedicels | pubescent, sparsely to densely short- to long-stipitate-glandular. |
prickles sparse to dense, hooked or erect, puberulent, eglandular or sparsely to densely sessile- or short-stipitate-glandular. |
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Flowers | bisexual; petals white, obovate to ovate, 15–25(–30) mm; filaments filiform; ovaries glabrous, styles clavate, villous. |
bisexual; petals erect, then ascending, white, oblong to oblanceolate, 3–6(–8) mm; filaments laminar; ovaries pubescent, rarely glabrous. |
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Fruits | dark purple, hemispheric, to 1 cm; drupelets 10–40, coherent, separating from torus. |
reddish purple to nearly black, depressed globose to conic, 1–2 cm; drupelets 20–60, coherent, separating from torus. |
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2n | = 14, 21. |
= 14. |
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Rubus deliciosus |
Rubus leucodermis |
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Phenology | Flowering May–Aug. | |||||
Habitat | Rocky canyons, outcrops, stream banks | |||||
Elevation | 1800–2900 m (5900–9500 ft) | |||||
Distribution |
CO; NM; OK; WY
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AK; AZ; CA; ID; MT; NM; NV; OR; UT; WA; BC; n Mexico
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Discussion | Rubus deliciosus is recognized by its decumbent to erect, unarmed stems, relatively small simple leaves with obtuse to broadly rounded lobes, shallowly cordate bases, sparsely hairy abaxial surfaces, large flowers, white petals, glabrous or sparsely hairy sepals, and densely villous clavate styles. The distinction between R. deliciosus and R. neomexicanus is not always clear, especially when the former has more narrowly obtuse lobes and denser leaf abaxial hairs. Rubus deliciosus is also similar to R. bartonianus of Idaho and Oregon, as well as the Mexican R. trilobus Seringe. It might be reasonable to recognize a broader concept of R. deliciosus, one containing multiple infraspecific. Rubus deliciosus and its close relatives require a revisionary study. Rubus deliciosus has long been planted for its ornamental value because of its large, showy flowers. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). Rubus leucodermis is similar to R. occidentalis, differing primarily by its leaflets having acuminate apices and lateral leaflets that are distinctly stalked. Prickles on the pedicels of R. occidentalis are erect; those of R. leucodermis tend to be hooked. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 39. | FNA vol. 9, p. 44. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus | Rosaceae > subfam. Rosoideae > tribe Rubeae > Rubus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | R. medius, R. roezlii | R. occidentalis subsp. leucodermis | ||||
Name authority | Torrey: Ann. Lyceum Nat. Hist. New York 2: 196. (1827) | Douglas ex Torrey & A. Gray: Fl. N. Amer. 1: 454. (1840) | ||||
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