Flora of North America species comparison

bark exfoliating in shreds;

nodal diaphragms 2.5–4 mm thick;

branchlets uniformly red, purplish red, or chestnut, subterete, glabrous or very sparsely arachnoid, growing tips not enveloped by unfolding leaves;

tendrils red-pigmented when young, along length of branchlets, persistent, branched, tendrils (or inflorescences) at only 2 consecutive nodes;

nodes not red-banded.

bark exfoliating in shreds;

nodal diaphragms 0.5–2.5 mm thick;

branchlets terete, densely tomentose to arachnoid-floccose or glabrous, sometimes with spinose, gland-tipped hairs, growing tips not enveloped by unfolding leaves;

tendrils along length of branchlets, persistent, branched, tendrils (or inflorescences) at almost all nodes;

nodes not red-banded.

stipules 1.5–3 mm;

petiole somewhat shorter than blade;

blade usually cordate, 8–14 cm, usually deeply 3(–5)-lobed, apex long acuminate, abaxial surface not glaucous, glabrous, visible, veins and vein axils sometimes hirtellous, adaxial surface glabrous.

stipules 2–4 mm;

petiole ± equaling blade;

blade cordate, usually 3-shouldered, sometimes unlobed or deeply 3(–5)-lobed, 10–20 cm, apex usually acute, abaxial surface not glaucous, densely and persistently arachnoid, concealed (except sometimes veins) by hairs, adaxial surfaces glabrous or sparsely pubescent.

6–18 cm.

6–14 cm.

functionally unisexual.

functionally unisexual.

bluish black to black, slightly or not glaucous, globose, 8–10 mm diam., skin separating from pulp;

lenticels absent.

black, usually not, sometimes slightly, glaucous, globose, 12+ mm diam., skin separating from pulp;

lenticels absent.

= 38.

= 38.