Flora of North America species comparison

erect, green to purple-green, apex never flexuous.

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

petiole 0–2 mm;

blade usually oblanceolate to linear, sometime elliptic, 2–8(–10) × 0.2–1.4 cm, base acute, margins entire or irregularly and shallowly sinuate, apex acute.

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.

terminal (often appearing leaf opposed), glands absent, staminate flowers 3–45 per raceme; staminate bracts 1–1.5 mm.

terminal (often appearing leaf-opposed), glands absent, staminate flowers 2–8[–10] per raceme; staminate bracts 1–1.8 mm.

staminate 1.3–2 mm, persistent base 0.3–0.6 mm; pistillate 3.5–4 mm in fruit.

staminate 0.7–2 mm, persistent base 0.4–1.5 mm; pistillate 2–4 mm in fruit.

sepals 4–5, green, 1–1.5 mm;

stamens 2, filaments 0.2–0.4 mm.

sepals 3–4[–5], green, 1–1.5 mm;

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

sepals linear, 1–1.8 mm;

styles connate 1/4–1/3 length;

stigmas undulate.

sepals ovate, 1.3–3.5 mm;

styles connate 1/3 length;

stigmas subpapillate to undulate.

7–8 mm wide.

6.5–7 mm wide, often 1 carpel maturing.

brown with tan streaks, 3–4 mm.

dark brown, 2.5–3.8 mm.

= 44.

= 44.