Flora of North America species comparison

erect to decumbent, dark green, apex never flexuous.

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

usually 3-foliolate, sometimes 3-lobed nearly to base;

petiole 7–18 mm;

leaflets: blade lanceolate, base acute, margins deeply and coarsely serrate, sinuses often extending 1/2+ to midvein, apex acute, central one 2.5–4 × 1–2 cm, lateral ones often with basal lobe.

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 10–20 per raceme;

staminate bracts 0.5–1.5 mm.

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

staminate bracts 1–1.8 mm.

staminate 0.8–1.6 mm, persistent base 0.3–0.7 mm;

pistillate 2.5–3 mm in fruit.

staminate 0.7–2 mm, persistent base 0.4–1.5 mm;

pistillate 2–4 mm in fruit.

sepals 3–4, green, 1–1.4 mm;

stamens 3, filaments 3.5–4 mm.

sepals 3–4[–5], green, 1–1.5 mm;

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

sepals lanceolate, 2–3 mm;

styles connate 1/4–1/2 length;

stigmas undulate to subpapillate.

sepals ovate, 1.3–3.5 mm;

styles connate 1/3 length;

stigmas subpapillate to undulate.

6–7 mm wide.

6.5–7 mm wide, often 1 carpel maturing.

dark brown, 3–3.2 mm.

dark brown, 2.5–3.8 mm.

= 44.