Flora of North America species comparison

mainly 0.5–4(–5) dm;

stems usually branched from base, terete, stout, angled;

herbage scurfy.

alternate, subsessile or proximal short petiolate;

blade ascending, oblong, oblong-ovate, or lanceolate to elliptic, 5–40 × 2–10 mm, thin, base acute to obtuse, margin entire, apex acute to acuminate.

alternate or proximalmost subopposite, short petiolate or distal ones sessile;

petiole 2–5 mm;

blade cordate-ovate or subreniform to ovate to deltoid-ovate or oval, mainly 6–40 × 4–30 mm, base truncate to subcordate or broadly cuneate, margin entire or in some subhastately lobed or sometimes undulate-dentate, apex acute to rounded.

of both sexes in small axillary glomerules, 5-merous.

usually in fascicles of 1–3 in proximal axils.

light brown to amber, 1–1.5 mm.

brownish to whitish, 1.5–2.3 mm.

bracteoles almost sessile, broadly cuneate, 2–5 × (2–)2.5–5 mm, united to summit, truncate at summit, sides smooth or obscurely tuberculate.

bracteoles monomorphic or dimorphic, larger ones on stipes (2–)4–8(–15) mm, others sessile, united at base, round-triangular or suborbicular, 4–6 mm, irregularly and coarsely dentate and with ± densely beset with flat, cristate, or hornlike appendages, smaller bracteoles (lacking or rare in var. asterocarpa) in same axils, oblong to cuneate, 3–4 mm, apex truncate, dentate only at summit, faces smooth.

glomerules in distal axils or in short, naked, terminal (early deciduous) panicles;

flowers with 5-parted calyx.

= 36.

= 18.