Flora of North America species comparison

usually ascending, occasionally erect, often arched at tips, 20–80 cm, sparsely to moderately pilose to villous or with short, incurved hairs, hairs often concentrated at nodes and distally, occasionally in 2 bands along opposite sides of stem.

erect, unbranched or branched, 15–80 cm, usually glabrous, rarely pilose.

opposite;

stipules usually distinct, sometimes connate basally on one side of stem, small scales, irregularly toothed, fringed, or divided, 1–1.5 mm, sparsely to moderately villous distally;

petiole 0.3–1.6 mm, moderately pilose to villous;

blade oblong to oblong-lanceolate, 8–40 × 3–12 mm, base asymmetric, one side usually angled or rounded, other side ± truncate to cordate-auriculate, margins serrulate, apex angled with blunt tip, abaxial surface pale green or faintly to strongly reddish tinged, adaxial surface usually reddish-mottled or with conspicuous reddish spot, both surfaces usually sparsely to moderately pilose, especially toward base, sometimes glabrous; 3–5-veined from base, pinnate distally, veins faint.

petiole absent;

blade oblanceolate or obovate, 20–50 × 5–10 mm, base subcordate or cuneate, margins finely serrulate, apex usually acute, occasionally obtuse, occasionally mucronulate, surfaces usually sparsely pilose, occasionally glabrate;

venation pinnate, midvein prominent.

narrowly obconic, 0.5–1 × 0.3–0.7 mm, glabrous;

glands 4, usually green, sometimes reddish purple, oblong to nearly circular, 0.2–0.4 × 0.3–0.5 mm;

appendages white or pinkish, ovate to broadly elliptic, 0.2–1 × 0.2–1.5 mm, distal margin entire.

cupulate, 0.9–1.2 × 1.3–1.6 mm, sparsely pilose;

glands 4, elliptic to ovate, 0.5–0.7 × 0.7–1 mm;

horns absent.

5–28.

10–12.

ovary glabrous;

styles 0.6–2.5 mm, 2-fid 1/2 length.

ovary glabrous, styles 1.6–1.8 mm, 2-fid.

ovoid, 1.6–2.3 × 1.5–2.4 mm, glabrous;

columella 1.4–1.6 mm.

globose or subglobose, 2.5–3 × 2.5–3 mm, slightly 3-lobed;

cocci rounded, sparsely verrucose, glabrous;

columella 1.9–2.1 mm.

dark brown, sometimes with thin, white coating (often more persistent along angles than faces), elliptic-ovoid to ovoid, rounded-angular in cross section, 1–1.6 × 0.5–0.8 mm, surface finely and irregularly wrinkled, sometimes faintly so, or with indistinct, shallow, rounded cross ridges.

dark brown, ovoid, dorsiventrally compressed, 2–2.2 × 1.5–1.7 mm, smooth;

caruncle ± reniform, 0.2–0.5 × 0.2–0.5 mm.

solitary at distal nodes or in small, cymose clusters at branch tips;

peduncle 0.5–2.5 mm.

peduncle absent.

arrangement: terminal pleiochasial branches (3–)5, proximalmost node 3-branched, more distal ones 1–3 times 2-branched;

pleiochasial bracts similar in shape and size to distal leaves;

dichasial bracts distinct, ovate-triangular, base obtuse, margins finely serrulate, apex obtuse, mucronulate;

axillary cymose branches 0–7(–14).

= 12, 14, 22.