Flora of North America species comparison

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

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

petiole 15–85 mm;

blade ovate to broadly cordate, 4.5–10(–13) × 3.5–10 cm, base cordate, margins serrate, apex 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 absent, staminate flowers 20–60 per raceme; staminate bracts 1.5–2 mm.

terminal (appearing leaf opposed), glands absent, staminate flowers 2–5 per raceme; staminate bracts 1–2 mm.

staminate 1.5–2.2 mm, persistent base 0.7–1 mm; pistillate 2.5–3 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 mm;

stamens 3, filaments 0.2–0.5 mm.

sepals 3–4, green, 1.5–2.5 mm;

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

sepals elliptic to ovate, 1.5–2 mm;

styles connate 1/4–1/3 length;

stigmas papillate.

sepals rhombic-lanceolate, 1–4 mm;

styles connate 1/4 length;

stigmas undulate.

11–13 mm wide.

6–7 mm wide.

dark brown, 4.3–5.3 mm.

dark brown, 2.5–3.2 mm.

, 15–20 dm.