Flora of North America species comparison

simple or more commonly divaricately branching throughout, branches terete;

herbage whitish scurfy to glabrate.

mostly alternate, shortly petiolate;

blade narrow to broadly rhomboid, lanceolate, oblanceolate, or elliptic, (8–)12–35(–42) × 6–16 mm, thin, margin coarsely and irregularly dentate, glabrescent adaxially, somewhat scurfy abaxially.

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 or interrupted terminal spikes.

in subterminal, axillary glomerules.

with 4 or 5 sepals.

in axillary glomerules.

in axillary glomerules of 5–10.

circular.

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

radicle inferior.

bracteoles sessile or on the stipe to 0.5 mm, rhombic to obovate, almost flat to convex, 2.2–4 × 1.7–2.7 mm, thin or somewhat thickened in age, connate in basal 1/2, margin entire in basal 1/2, 2–4-toothed in distal 1/2, apex acute, scurfy.

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.