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, 7–20 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 1–2 mm, reduced distally;

blade spatulate-cuneate, 8–10 × 4–5 mm (greatly reduced in size proximally), base cuneate, margins entire, apex rounded to emarginate or obcordate, surfaces glabrous;

venation pinnate.

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.

campanulate, 0.8–1.1 × 0.7–1 mm, glabrous;

glands 4, elliptic to trapezoidal, 0.3–0.6 × 0.6–1.2 mm;

horns divergent, 0.5–1 mm.

5–28.

10–15.

ovary glabrous;

styles 0.6–2.5 mm, 2-fid 1/2 length.

ovary smooth, glabrous;

styles 0.6–1 mm, 2-fid.

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

columella 1.4–1.6 mm.

depressed-globose, 1.8–2.2 × 2.2–2.9 mm, slightly lobed;

cocci rounded to slightly flattened, smooth, glabrous;

columella 1.5–1.8 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.

reddish brown to brown, often glaucous, oblong, 1.3–1.4 × 0.8–0.9 mm, abaxial faces with 15–20 shallow pits or almost smooth, adaxial faces with 4–6 large shallow pits or irregular oblong grooves;

caruncle conic, hat-shaped, 0.3–0.4 × 0.4–0.6 mm.

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

peduncle 0.5–2.5 mm.

peduncle 0.2–0.6 mm.

arrangement: terminal pleiochasial branches 3, each 1–3(–4) times 2-branched;

pleiochasial bracts obovate, similar in size to distal leaves;

dichasial bracts distinct or basally subconnate, not imbricate, triangular-ovate, base truncate or cordate, margins entire, apex mucronate;

axillary cymose branches 1–4.

= 12, 14, 22.