Flora of North America species comparison

mostly erect and branched, branches green, obtusely angled or striate, glabrate.

erect, mostly branched.

alternate except the proximalmost, petiolate;

blade green on both sides, rhombic-lanceolate to lanceolate, oblong, or narrowly lance-oblong or hastate-ovate, 25–120 × 3–40(–75) mm, entire or toothed, proximal ones broadly cuneate or sometimes hastate subbasally with obliquely antrorse basal lobes, distal cauline leaves lanceolate and entire.

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.

compact or interrupted spiciform or paniculiform clusters.

mostly 5-merous.

5-merous.

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

dimorphic: brown, 2.5–3(–3.5) mm wide, or black, 1–2 mm wide;

radicle of brown seeds subbasal to median, antrorse.

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 green becoming black, rhombic to rhombic-triangular, or ovate-rhombic, compressed, ± uniformly sized, 2–7(–20) mm, base mostly hastate, acute, margin united almost to middle, entire or sparingly toothed, surfaces tuberculate.

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

= 36.

= 18.