Flora of North America species comparison

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

spreading to erect, 5–25 dm, glabrous when young, glaucous.

opposite, subsessile;

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

whorled (3s), sometimes opposite;

blade linear to narrowly oblanceolate or lanceolate, 15–60 mm, margins 4–10-toothed.

thyrses, glabrous or sticky-hairy.

panicles, glabrous or glandular-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 3.8–7.2 mm, lobes lanceolate to ovate;

corolla red, 21–31 mm, tube plus indistinct throat 16–24 mm, adaxial lip 5.5–9.5 mm;

pollen sacs 0.8–1.1 mm;

staminode densely yellow-hairy, included.