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.

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.

opposite or subopposite at least proximally;

petiole (0–)1–3(–4) cm;

blade triangular-hastate, lobes spreading, 20–100 mm and almost as wide, base truncate or subcordate, margin entire, serrate, dentate, or irregularly toothed, apex acute to obtuse.

in axillary glomerules.

in spiciform naked spikes 2–9 cm, sometimes forming terminal panicles;

glomerules tight, contiguous or irregularly spaced.

in glomerules mainly in distal axils;

sepals 3–5.

brown, 1–2 mm wide.

dimorphic: brown, flattened, disc-shaped, 1–2.5 mm wide, or black, 1–1.5 mm wide;

radicle subbasal, obliquely antrorse to spreading.

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, becoming brown to black at maturity, triangular-hastate to triangular-ovate, veined or veins obscure, 3–5 mm, thin to thickened, spongy, base truncate to obtuse, margin united at base, lateral angles mostly entire, apex acute, faces smooth or with 2 tubercles.

= 18.

= 18.