Flora of North America species comparison

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

erect, virgate with age, 5–15 dm, glabrous when young, glaucous.

opposite, subsessile;

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

opposite;

blade lanceolate to ovate, 10–65 mm, margins usually 2–12-toothed.

thyrses, glabrous or sticky-hairy.

panicles, 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 3.5–6.7 mm, lobes lanceolate;

corolla purplish brown, abaxial lip pale yellow, brown-purple lined, 11–15 mm, tube plus distinct throat 5.5–9.5 mm, longer than adaxial lip, adaxial lip 2.6–6 mm;

pollen sacs 0.6–0.9 mm;

staminode densely yellow-hairy, exserted.

= 16.