Flora of North America species comparison

glabrous.

glabrous, sometimes glaucous.

twining-climbing.

decumbent, procumbent, or ± twining-climbing, 15–40 cm.

blade ± cordate, to 50–120 mm, base rounded or lobed, lobes rounded or 1-pointed, basal sinus ± quadrate to rounded.

blade narrowly triangular-hastate, to 20 mm, base lobed, lobes ± oblong to rhombic, 1-pointed, basal sinus quadrate to rounded.

immediately subtending sepals, lanceolate, to 30 × 15–35 mm, proximally saccate, margins strongly enfolding sepals, apex obtuse to truncate.

immediately subtending, or to 3 mm distant from, sepals, elliptic to broadly elliptic-oblong, 3–7 × 2.5–4 mm, margins entire.

sepals oval to ovate, 15–23 mm;

corolla white, sometimes pinkish-striped, rarely otherwise pink-tinged, 43–70[–88] mm;

stamens 23–40 mm;

anthers 4–6.5 mm.

sepals 9–13 mm;

corolla white, 25–40 mm.