Flora of North America species comparison

decumbent, twining, or erect, light green, apex usually flexuous.

erect, brownish red to maroon-green, apex never flexuous.

petiole 6–38 mm;

blade triangular to cordate, 1.9–6 × 1.5–3.5 cm, base truncate to cordate, margins serrate to crenate, apex acute.

petiole 0.5–2 mm;

blade acicular to narrowly oblong, 1–6 × 0.2–0.6 cm, base acute to subcuneate, margins usually entire, sometimes serrulate, apex acute to obtuse.

terminal (often appearing leaf-opposed), glands absent, staminate flowers 2–8[–10] per raceme;

staminate bracts 1–1.8 mm.

terminal (appearing leaf opposed) or axillary, glands absent, staminate flowers 2–3(–5) per raceme;

staminate bracts 2–2.5 mm.

staminate 0.7–2 mm, persistent base 0.4–1.5 mm;

pistillate 2–4 mm in fruit.

staminate 1–2 mm, persistent base 0.5–0.8 mm, pistillate 2–3 mm in fruit.

sepals 3–4[–5], green, 1–1.5 mm;

stamens 3–4(–5), filaments 0.3–0.6 mm.

sepals 3–4(–5), green, 1–2.5 mm;

stamens 3–4, filaments 1.2–1.4 mm, connate basally.

sepals ovate, 1.3–3.5 mm;

styles connate 1/3 length;

stigmas subpapillate to undulate.

sepals lanceolate, 1.5–2 mm;

styles connate 1/5 length;

stigmas undulate to slightly papillate.

6.5–7 mm wide, often 1 carpel maturing.

4–5 mm wide.

dark brown, 2.5–3.8 mm.

mottled dark olive brown, 2.5–3 mm.

= 44.