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 more commonly divaricately branching throughout, branches terete;

herbage whitish scurfy to glabrate.

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, short petiolate, blade prominently 3-veined, ovate to lanceolate, mainly 12–80 × 6–50 mm, margin irregularly sinuate-dentate and often subhastately lobed or rarely some entire, apex acute to obtuse.

in axillary glomerules.

in axillary glomerules or interrupted terminal spikes.

in glomerules mainly in distal axils;

sepals 3–5.

with 4 or 5 sepals.

in axillary glomerules of 5–10.

brown, 1–2 mm wide.

dimorphic: brown, 2–2.5 mm wide, or black, 1–2 mm wide;

radicle inferior.

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 prominently 3–5-veined, sessile or short stipitate, (3–)4–6(–10) mm and as wide, sometimes subhastately lobed at base, conspicuously dentate, sharply tuberculate to almost smooth on faces.

= 18.

= 18.