Flora of North America species comparison

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

erect, green, apex never flexuous.

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.

petiole 3–15 mm;

blade triangular-lanceolate, 2.7–6.7 × 1–3 cm, base truncate to cordate, margins serrate, apex acute.

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

staminate bracts 1–1.8 mm.

terminal (appearing leaf opposed), glands absent, staminate flowers 11–40 per raceme, evenly distributed;

staminate bracts 1–1.5 mm.

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

pistillate 2–4 mm in fruit.

staminate 1.5–2 mm, persistent base 1–1.8 mm, longer than subtending bract;

pistillate 3–4 mm in fruit.

sepals 3–4[–5], green, 1–1.5 mm;

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

sepals 3, green, 1.2–2.1 mm;

stamens 3, filaments 0.3–0.8 mm.

sepals ovate, 1.3–3.5 mm;

styles connate 1/3 length;

stigmas subpapillate to undulate.

sepals lanceolate-ovate, 1.3–2.3 mm;

styles connate 1/3 length;

stigmas papillate.

6.5–7 mm wide, often 1 carpel maturing.

7–8 mm wide.

dark brown, 2.5–3.8 mm.

dark brown, 3–4 mm.

= 44.

= 44.