Flora of North America species comparison

erect, spreading with age, 5–20 dm, glabrous when young, glaucous.

climbing, 10–30 dm, glabrous or short-hairy when young.

opposite, subsessile;

blade oblanceolate or lanceolate, 10–40 mm, margins 4–12-toothed.

opposite;

blade ovate, 20–65 mm, base rounded, truncate, or cordate, margins usually 3–11-toothed.

thyrses, glabrous or sticky-hairy.

panicles, glandular and hairy.

calyx 4–8 mm, lobes lanceolate to ovate;

corolla white or cream, lobes sometimes rose tinged, lined purplish or pinkish, 12–18 mm, tube plus distinct throat 4–8 mm, shorter than adaxial lip, adaxial lip 8–12 mm;

pollen sacs 0.6–0.8 mm;

staminode glabrous, slightly exserted.

calyx 7–13 mm, lobes lanceolate;

corolla red to reddish orange, 31–43 mm, tube plus indistinct throat 18–25 mm, adaxial lip 11–21 mm;

pollen sacs 1.1–1.5 mm;

staminode densely yellow-hairy, included.

= 16.