Flora of North America species comparison

trailing or twining, dark green, apex flexuous.

erect, purple-green to reddish black, 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 1–5 mm;

blade oblong to oblanceolate, 3–7 × 1–2.8 cm, base acute to obtuse, margins coarsely serrate, teeth apices often somewhat recurved, 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 (appearing leaf opposed), glands absent, staminate flowers 2–5 per raceme;

staminate bracts 1–2 mm.

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

pistillate 3–7 mm in fruit.

staminate 1.3–1.6 mm, persistent base 0.2–0.4 mm;

pistillate 2–3 mm in fruit.

sepals 3, green, 0.7–1.2 mm;

stamens 3, filaments 0.2–0.4 mm.

sepals 3–4, green, 1.5–2.5 mm;

stamens 4–5, filaments 0.7–1.3 mm, connate 1/2 length.

sepals lanceolate, 0.7–1.5 mm;

styles connate 1/3 length;

stigmas smooth to undulate.

sepals rhombic-lanceolate, 1–4 mm;

styles connate 1/4 length;

stigmas undulate.

4–5 mm wide.

6–7 mm wide.

dark brown to black, 1.9–2.2 mm.

dark brown, 2.5–3.2 mm.