Flora of North America species comparison

biennial, creeping, tip-rooting, flowering branches often erect, glabrous or sparsely hairy, sparsely to densely short- to long-stipitate-glandular, rarely eglandular, not pruinose;

prickles sparse to dense, erect to retrorse, weak, slender, 1–3(–5) mm, narrow-based;

bristles sparse to dense, erect or retrorse, narrow, flexible and weak, not gland-tipped.

biennial, erect, glabrescent, eglandular or stipitate-glandular, strongly pruinose;

prickles absent or sparse to dense, erect, weak, 1–4 mm, broad-based;

bristles present or absent.

persistent, ternate or, rarely, palmately compound, lustrous;

stipules linear to narrowly lanceolate, (2–)5–15(–20) mm;

leaflets 3(–5), terminal obovate to suborbiculate, 1.7–6.5 × 1–5.2 cm, base cuneate to rounded, unlobed, margins moderately to coarsely doubly serrate, apex acute to rounded, abaxial surfaces with bristles on midvein or unarmed, glabrous or sparsely hairy, sparsely to densely short-stipitate-glandular along largest veins.

deciduous, pinnately compound;

stipules filiform, 5–10 mm;

petiole unarmed or with prickles, strigose or glabrous, glandular or eglandular;

terminal leaflets petiolulate, lateral sessile or subsessile;

leaflets 3–5(–7), terminal ovate to lanceolate, 7–15 × 4–11 cm, base rounded to cordate, unlobed or 2-lobed, margins serrate to doubly serrate, apex acute to attenuate, abaxial surfaces unarmed or with prickles, strongly white-tomentose, eglandular or glandular.

terminal on short shoots, usually appearing axillary, 1–7(–10)-flowered, racemiform.

terminal and axillary, (1–)3–7(–20)-flowered, racemiform.

unarmed or bristles moderate to sometimes dense, erect to retrorse, moderately to densely hairy, sparsely to densely short- to long-stipitate-glandular.

unarmed or prickles sparse, hooked, glabrous or sparsely pubescent, stipitate-glandular or eglandular.

bisexual;

petals white, obovate to oblanceolate, 6–10 mm;

filaments filiform;

ovaries glabrous.

bisexual;

petals white to greenish white, spatulate to obovate, 5–10 mm;

filaments filiform or slightly dilated basally;

ovaries pubescent.

black, globose to cylindric, to 1 cm;

drupelets (5–)10–15(–20), strongly coherent, separating with torus attached.

usually red to whitish, rarely amber, globose to conic, 0.5–2 cm;

drupelets 10–60, coherent, separating from torus.

= 14, 21, 28, 35, 56.