Flora of North America species comparison

erect to arching, glabrate or sparsely to densely hairy, eglandular or sparsely short-stipitate-glandular, rarely densely long-stipitate-glandular, not pruinose;

bark usually papery with age, peeling (especially toward base);

prickles absent or sparse to dense, erect, slender, 1–5 mm, broad- to narrow-based.

biennial, erect, rarely arching, sparsely to densely hairy (especially young), eglandular, not pruinose;

bark not papery, peeling;

prickles usually dense, hooked to retrorse, usually stout, 3–6 mm, broad-based.

deciduous, ternate;

stipules filiform to linear, 3–10 mm;

terminal leaflets ovate, 4–15 × 3.5–15 cm, base truncate, rounded to shallowly cordate, shallowly, sharply lobed, margins coarsely serrate to doubly serrate, apex acute to acuminate, abaxial surfaces unarmed or with erect prickles on midvein, moderately to densely hairy, eglandular, rarely stipitate-glandular along midvein.

deciduous to semievergreen, usually ternate, sometimes palmately compound;

stipules filiform or linear to lanceolate, 3–15 mm;

leaflets 3–5, terminal cuneate to obovate, 2–6 × 3–4 cm, base cuneate, unlobed, margins serrate, rarely doubly serrate, apex broadly rounded to subtruncate, often cuspidate, abaxial surfaces often with prickles on midveins, densely gray- to white-hairy, sparsely to densely sessile-glandular.

terminal and axillary, 1–2-flowered.

terminal on short shoots, sometimes appearing axillary, (1–)3–5(–12)-flowered, cymiform.

unarmed or prickles sparse, erect, moderately to densely hairy, eglandular, rarely short-stipitate-glandular.

unarmed or prickles sparse to moderate, hooked to retrorse, moderately to densely hairy, eglandular or sparsely to moderately sessile-glandular.

bisexual;

petals pink to magenta, broadly to narrowly obovate, 10–30 mm;

filaments laminar;

ovaries glabrous.

bisexual;

petals white, elliptic to obovate, 5–15 mm;

filaments filiform;

ovaries glabrous or glabrate.

yellow, orange, or red, globose to ovoid, 1–2 cm;

drupelets 20–80, strongly coherent, separating from torus.

black, globose to cylindric, 0.6–2 cm;

drupelets 15–50, strongly coherent, separating with torus attached.

= 14.

= 21, 28.