Flora of North America species comparison

erect to prostrate, branched from base, 0.5–2.5(–4) dm, farinose.

erect to ascending, branched at apex of taproot, 2.5–8 dm, somewhat viscid and farinose.

nonaromatic;

petiole to 1 cm;

blade lanceolate to oblong or ovate, 0.5–4 × 0.3–1.5 cm, base cuneate, margins undulate-dentate, teeth obtuse or acute, apex obtuse or acute, densely farinose, glaucous abaxially.

nonaromatic;

petiole 1–12 cm;

blade triangular, 4.5–10 × 3–9 cm, base truncate to cordate, margins sinuate-dentate, apex acute to acuminate, sparsely farinose.

glomerules in terminal or lateral spikes, 5–10 cm;

glomerules subglobose, 1.8–2.5 mm diam.;

bracts leaflike in inflorescence, elliptic, 0.2–1 × 0.1–0.5 cm, or absent at least in terminal 1/2 of inflorescence.

dense glomerules sessile on terminal spikes;

spikes 5–19 cm;

glomerules 3–5 mm diam., flowers developing at about same time;

bracts leaflike, subtending lower glomerules, absent for over 1/2 inflorescence, triangular, broadly hastate, 1–3.5 × 0.8–4 cm, apex acuminate, base truncate to hastate, sparsely farinose.

perianth segments 3–4;

lobes obovate to oblong, 0.5–0.7 × 0.4–0.5 mm, apex obtuse, rounded, not keeled, covering fruit at maturity;

stamen 1;

stigmas 2.

perianth segments connate into 0.5–0.9 mm tube, lobes oblong or elliptic, 0.6–0.9(–1.1) × 0.4–1.2 mm, apex obtuse, rounded or truncate, scarcely abaxially keeled throughout, glabrous, not covering fruit at maturity;

stamens (4–)5;

stigmas 2.

obovoid;

pericarp adherent, ± smooth.

mostly horizontal, some vertical, margins rounded; vertical seeds ovoid to round, 0.6–1.1 mm diam.; horizontal seeds round, 0.6–1.1 mm diam.;

seed coat reddish brown, rugose-punctate.

obovoid or rotund, 1.5–2 mm in diam., margins rounded;

seed coat black, rugose.

ovoid;

pericarp nonadherent, smooth.

= 18.