Flora of North America species comparison

trailing or twining, dark green, apex flexuous.

usually decumbent or twining, rarely erect, gray-green to light green, apex flexuous.

petiole 6–22 mm;

blade narrowly ovate to lanceolate, 2.5–4 × 1.5–2 cm, base shallowly cordate to truncate, margins serrate to crenate, apex acute to acuminate.

petiole 15–85 mm;

blade ovate to broadly cordate, 4.5–10(–13) × 3.5–10 cm, base cordate, margins serrate, apex acuminate.

terminal (often appearing leaf-opposed), glands stipitate, prominent throughout, staminate flowers 10–30 per raceme;

staminate bracts 0.5–1.5 mm.

terminal (often appearing leaf-opposed), glands absent, staminate flowers 20–60 per raceme;

staminate bracts 1.5–2 mm.

staminate 1–2 mm, persistent base 0.3–0.7 mm;

pistillate 3–7 mm in fruit.

staminate 1.5–2.2 mm, persistent base 0.7–1 mm;

pistillate 2.5–3 mm in fruit.

sepals 3, green, 0.7–1.2 mm;

stamens 3, filaments 0.2–0.4 mm.

sepals 3, green, 0.7–1 mm;

stamens 3, filaments 0.2–0.5 mm.

sepals lanceolate, 0.7–1.5 mm;

styles connate 1/3 length;

stigmas smooth to undulate.

sepals elliptic to ovate, 1.5–2 mm;

styles connate 1/4–1/3 length;

stigmas papillate.

4–5 mm wide.

11–13 mm wide.

dark brown to black, 1.9–2.2 mm.

dark brown, 4.3–5.3 mm.

, 15–20 dm.