Flora of North America species comparison

simple or more commonly branched throughout, mainly 2–8(–10) dm, branches mostly obtusely angled;

herbage scurfy, becoming glabrate.

simple or branched, erect or ascending, terete or subangular.

alternate or proximalmost opposite, short petiolate proximally, sessile and often cordate-clasping distally;

blade ovate to deltoid or oval, 4–30(–40) × 3–30 mm, base truncate or subhastate to rounded, margin entire or dentate, apex acute to obtuse.

alternate or the proximalmost opposite, blade green, oblong, lanceolate, or ovate, proximal leaves lanceolate to rhombic-ovate, 10–30 × 5–13 mm, base rounded or hastately to cuneately narrowed to petiole, margin nearly always entire (some hastate), apex acute or rounded, rarely obtuse, glabrous on both sides.

in axillary glomerules.

in rather loose spiciform, axillary or terminal inflorescences.

in glomerules mainly in distal axils;

sepals 3–5.

5-merous.

enclosed by paired bracteoles.

brown, 1–2 mm wide.

small, not or only moderately dimorphic: black, convex, 1.5–2 mm wide, lustrous, or light brown or olivaceous, compressed, 2.5–3 mm wide, duller, with subbasal, spreading radicle.

bracteoles scarcely compressed, 2–3 mm and as wide, apex truncate to broadly rounded, with 3 (or more) teeth across summit, surfaces smooth (or rarely tuberculate).

bracteoles green, midvein never impressed, sessile or with stipes 0.5–1.5 mm, broadly ovate to rhombic-ovate, 3–5 mm, distinct nearly to base, base rounded or more often hastate-cuneate, margin entire or sparingly toothed, apex acute or acuminate, faces smooth.

= 18.

= 18.