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 tardily exfoliating in plates;

nodal diaphragms to 1 mm thick;

branchlets terete, usually glabrous, sometimes sparsely hirtellous, growing tips enveloped by unfolding leaves;

tendrils absent or only at distalmost nodes, soon deciduous if not attached to support, branched, tendrils (or inflorescences) at only 2 consecutive 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 3–6.5 mm;

petiole 1/2 blade;

blade reniform, conduplicately folded, 5–10 cm, apex acute to short acuminate, usually 3-shouldered, rarely shallowly 3-lobed, abaxial surface not glaucous, usually glabrous, visible through hairs, veins and vein axils sometimes sparsely hirtellous, adaxial surface usually glabrous.

6–18 cm.

4–7 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, slightly glaucous, globose, 8–12 mm diam., skin separating from pulp;

lenticels absent.

= 38.

= 38.