Flora of North America species comparison

trailing or twining, dark green, apex flexuous.

erect to trailing, green to whitish green, apex never 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 10–40 mm;

blade triangular-lanceolate to triangular-ovate, 1.5–6 × 1–3.5 cm, base cordate to truncate, margins serrate, apex acute.

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 15–80 per raceme, distally clustered;

staminate bracts 1–2 mm.

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

pistillate 3–7 mm in fruit.

staminate 0.7–1 mm, persistent base 0.3–0.6 mm, shorter than subtending bract;

pistillate 3–4 mm in fruit.

sepals 3, green, 0.7–1.2 mm;

stamens 3, filaments 0.2–0.4 mm.

sepals 3–4, green, sometimes red-tinged, 1.2–2.3 mm;

stamens 3(–4), filaments 0.4–1 mm.

sepals lanceolate, 0.7–1.5 mm;

styles connate 1/3 length;

stigmas smooth to undulate.

sepals lanceolate, 1.8–5 mm;

styles connate 1/3 length;

stigmas papillate.

4–5 mm wide.

7–9 mm wide.

dark brown to black, 1.9–2.2 mm.

dark brown with light brown streaks, 3–4 mm.