Flora of North America species comparison

ascending to erect, villous (hairs jointed), rarely glabrous.

erect, 20–65 cm, villous, rarely glabrous.

cauline, sometimes also basal, opposite;

petiole absent, sometimes present on basal leaves;

blade not fleshy, leathery, margins entire or serrate.

blade lanceolate to ovate, 8–20 × 4–13 mm, base clasping, rounded to subcordate, margins entire or serrate, not or slightly revolute, apex rounded to obtuse or acute, surfaces villous, rarely glabrous, papillate, distinctly punctate abaxially.

axillary, flowers 1 or 2 per node;

bracts present.

present or absent;

bracteoles present, 2.

0–3(–5) mm;

bracteoles 6–9(–11) mm.

bisexual;

sepals 5, distinct, linear to linear-lanceolate, calyx ± bilaterally symmetric, campanulate;

corolla white, sometimes tinged purple or pink, bilaterally symmetric, bilabiate to bilabiate and personate, tubular to salverform, tube base not spurred or gibbous, lobes 5, abaxial 3, adaxial 2, throat hairy;

stamens 2, medially adnate to corolla, filaments glabrous, pollen sacs parallel to filaments, connective not dilated;

staminodes 0 or 2, minute;

ovary 2-locular, placentation axile;

stigma crateriform.

calyx lobes 5–7 × 0.5–1.5 mm;

corolla tubular, 5–9 mm, tube yellow, veins bluish purple, limb white.

capsules, dehiscence septicidal, sometimes also loculicidal.

conic, 4–5 × 2–2.8 mm.

ca. 200, yellow to brown or black, ovoid to short-cylindric, wings absent.

0.2–0.4 mm.

= 22.