Rubus deliciosus
Rosaceae subfam. rosoideae
boulder raspberry, delicious raspberry
decumbent to erect, glabrous or sparsely short-hairy, eglandular or sparsely stipitate-glandular, not pruinose.
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.
alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound;
stipules present, rarely absent.
1-flowered.
pubescent, sparsely to densely short- to long-stipitate-glandular.
bisexual;
petals white, obovate to ovate, 15–25(–30) mm;
filaments filiform;
ovaries glabrous, styles clavate, villous.
torus usually enlarged, sometimes small or absent;
carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae);
ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula).
dark purple, hemispheric, to 1 cm;
drupelets 10–40, coherent, separating from torus.
achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets;
styles persistent or deciduous, not elongate (elongate but not plumose in Geum).
= 7(8).
= 14, 21.
Rubus deliciosus
Rosaceae subfam. rosoideae
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.)
Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily.
Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora)
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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