Flora of North America species comparison

erect, mostly branched.

many, sometimes crowded;

blade orbiculate to ovate or ovate-lanceolate to elliptic or oblong, 8–40 × 4–18 mm, base obtuse or rounded, white scurfy.

mostly opposite or mostly alternate;

petiole 0.3–4+ cm;

blade green on both sides, ovate or ovate-lanceolate to cordate-hastate at base, 15–180 × 8–135 mm, margin entire or more rarely irregularly toothed or lobed, apex attenuate to acuminate or rounded.

of spikes disposed in leafless panicles.

in dense terminal spikes.

5-merous.

in few-flowered, axillary clusters.

dimorphic, some ebracteolate and with 5-parted perianth, others without perianth enclosed by a pair of sessile or very shortly stipitate bracteoles.

dark red-brown, 2.5–3 mm.

of ebracteate flowers black, horizontal, convex, 1–2 mm wide, lustrous;

those of bracteolate flowers olivaceous brown, vertical, flat, 3–4.5 mm wide, dull.

bracteoles not compressed, 5–7 mm, faces usually with wartlike projections, scurfy.

bracteoles samaralike, orbicular to oval or ovate, compressed, 5–18 mm, united only at base, entire, faces smooth.

= 18.