Rubus bartonianus
Rubus neomexicanus
Barton's raspberry, bartonberry
New Mexico raspberry
erect, sparsely short-hairy, glabrescent, eglandular, not pruinose.
erect, sparsely to moderately short-hairy, sparsely stipitate-glandular, not pruinose.
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, simple;
stipules lanceolate to narrowly ovate, (4–)6–8(–10) mm;
blade cordate to broadly ovate, (2.5–)3.5–5.5(–6.5) × (2.5–)3.5–5.5(–8) cm, base shallowly to deeply cordate, palmately, shallowly to deeply 3–5(–7)-lobed, margins coarsely doubly dentate, apex acute to broadly obtuse, abaxial surfaces moderately hairy, sparsely stipitate-glandular.
1-flowered.
1(–2)-flowered.
moderately hairy, eglandular or sparsely stipitate-glandular.
sparsely to moderately hairy, sparsely to densely short- to long-stipitate-glandular.
bisexual;
petals white, obovate, (15–)20–25 mm;
filaments filiform;
ovaries glabrous, styles clavate, villous.
bisexual;
petals white, broadly obovate to suborbiculate, (15–)20–30(–35) mm;
filaments filiform;
ovaries glabrous, styles clavate, villous.
deep red, hemispheric, to 1 cm;
drupelets 10–30, coherent, separating from torus.
red, hemispheric, to 1 cm;
drupelets 20, coherent, separating from torus.
= 14.
Rubus bartonianus
Rubus neomexicanus
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 neomexicanus is recognized by its erect, unarmed stems, relatively small, simple leaves with acute to obtuse lobes, the terminal prominent, deeply cordate base, moderately hairy abaxially, large flowers, white petals, and densely long-hairy, clavate styles. The species is similar to R. bartonianus and R. deliciosus, and treating it as a variety of the latter species would be reasonable, as W. O. Focke (1910) considered the two conspecific.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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