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, 10–100 cm, glabrous.

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 linear, linear-lanceolate, oblong-elliptic, or obovate, 4–50 × 2–10 mm, base obtuse or truncate, margins finely serrulate, apex acute, obtuse, or truncate, sometimes mucronulate, surfaces glabrous;

venation inconspicuous, only 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 to slightly turbinate, 1.1–2 × 1.3–1.5 mm, glabrous or puberulent;

glands 4, elliptic to trapezoidal, 0.6–0.8 × 1–2 mm;

horns slightly convergent to divergent, 1–2 mm.

5–28.

15–20.

ovary glabrous;

styles 0.6–2.5 mm, 2-fid 1/2 length.

ovary glabrous;

styles 1–1.8 mm, 2-fid.

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

columella 1.4–1.6 mm.

depressed-globose, 2.5–3 × 3–4.5 mm, deeply 3-lobed;

cocci rounded to subangular, smooth, glabrous;

columella 1.9–2.3 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.

pale gray, subovoid, 1.6–2.4 × 1.3–1.8 mm, smooth;

caruncle boat-shaped, 0.4–0.6 × 0.4–0.6 mm.

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

peduncle 0.5–2.5 mm.

peduncle 1–3 mm.

arrangement: terminal pleiochasial branches 2–5, each 1–5 times 2-branched;

pleiochasial bracts lanceolate, elliptic or ovate, similar in size to distal leaves;

dichasial bracts distinct, ovate to subreniform, base cuneate to cordate, margins finely serrulate, apex acute, obtuse, or rounded, sometimes mucronulate or cuspidate;

axillary cymose branches 0–7.

= 12, 14, 22.