Rubus trivialis |
Rubus leucodermis |
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southern dewberry |
black raspberry, blackcap, blackcap raspberry, dark raspberry, dwarf bramble, western black raspberry, white-bark raspberry |
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Habit | Shrubs, to 3(–7) dm, sometimes climbing higher through other vegetation, moderately to densely armed. | Shrubs, 10–30 dm, armed. | ||||
Stems | biennial, initially low-arching, then falling and creeping (or climbing through other vegetation), glabrous or moderately hairy, sparsely to densely short- to long-stipitate-glandular, not pruinose; prickles moderate to dense, recurved, sometimes distally slender, 1–4 mm, broad-based; bristles absent or sparse to dense, erect to retrorse, red to purple, rarely green, slender, weak, gland-tipped. |
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 | persistent or semipersistent, ternate to palmately compound, lustrous; stipules filiform, linear, or lanceolate, 2–12(–15) mm; leaflets 3–5, terminal narrowly elliptic or ovate to obovate, 2–8.5 × 0.7–4.5 cm, base rounded to cuneate, unlobed, margins moderately to coarsely serrate to doubly serrate, apex acute to acuminate, abaxial surfaces with hooked prickles on midvein, glabrous or sparsely to moderately hairy, eglandular or sparsely short-stipitate-glandular along central vein. |
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 | terminal on short shoots, usually appearing axillary, 1(–3)-flowered. |
axillary and terminal, (1–)3–10(–12)-flowered, flat-topped cymiform or umbelliform. |
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Pedicels | prickles and, often, bristles moderate to dense, recurved, moderately to densely hairy, sparsely to moderately sessile- to short-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 to pink, elliptic to obovate, 10–16(–25) mm; filaments filiform; ovaries glabrous. |
bisexual; petals erect, then ascending, white, oblong to oblanceolate, 3–6(–8) mm; filaments laminar; ovaries pubescent, rarely glabrous. |
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Fruits | black, globose to ovoid, 1–1.5(–2) cm; drupelets 10–50, strongly coherent, separating with torus attached. |
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. |
= 14. |
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Rubus trivialis |
Rubus leucodermis |
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Phenology | Flowering Jan–Jun. | |||||
Habitat | Open woodlands, savannas, prairies, meadows, sand dunes, disturbed areas, dry to seasonally wet soil | |||||
Elevation | 0–200 m (0–700 ft) | |||||
Distribution |
AL; AR; FL; GA; IL; KS; KY; LA; MO; MS; NC; OK; SC; TN; TX; VA; Mexico (Coahuila, Nuevo León, Tamaulipas)
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AK; AZ; CA; ID; MT; NM; NV; OR; UT; WA; BC; n Mexico
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Discussion | Rubus trivialis is distinguished from other species of Rubus by its frequently glandular-bristly and generally creeping stems, abundant recurved prickles, and typically persistent or semipersistent, lustrous primocane leaves with relatively narrow leaflets. Although emerging primocanes typically reach to 30 cm above the ground, vigorous plants can have new primocanes standing erect to 70 cm that later fall to the ground or onto adjacent vegetation as they continue to enlarge. L. H. Bailey (1941–1945) believed that there was no clear separation between members of sect. Persistentes Fernald (referred to by Bailey as sect. Verotriviales [illegitimate sectional name for R. trivialis and associated species]) and sect. Procumbentes (by Bailey as sect. Flagellares; including R. flagellaris and related species). All characteristics that he recognized for distinguishing sect. Persistentes from sect. Procumbentes are often present in the latter, with the exception of hispid-setose stems, and glabrous plants of R. trivialis are difficult to distinguish from some plants of R. flagellaris; to include the latter species within the former would be reasonable. Rubus ×inferior L. H. Bailey is a putative hybrid of R. trivialis and R. cuneifolius. (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. 54. | 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. agilis, R. continentalis, R. duplaris, R. ictus, R. lucidus, R. macvaughii, R. mirus, R. nessianus, R. riograndis, R. rubrisetus, R. sons, R. tallahasseanus | R. occidentalis subsp. leucodermis | ||||
Name authority | Michaux: Fl. Bor.-Amer. 1: 296. (1803) | Douglas ex Torrey & A. Gray: Fl. N. Amer. 1: 454. (1840) | ||||
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