Flora of North America species comparison

5–15 dm, (stout).

petiole 6–15 cm (shorter distally);

blade deltate to lanceolate, lyrate, or sinuately lobed, or (distally) narrowly lanceolate, 5–20 cm × 30–70 mm (smaller distally), margins entire or subapically denticulate, apex acute.

sepals yellowish green, 4–6 × 1–1.5 mm;

petals white, 5–7 mm, blade 2.5–4 × 0.5–1 mm, claw 2–3.5 × 1–1.7 mm, margins dentate or incised (sublaciniate);

filaments 5–9 mm;

anthers 2.5–3.5 mm;

gynophore (1–)2–8(–10) mm.

5–12 mm, (thicker than gynophore).

divaricate, 4–13 cm × 1.5–2.5 mm;

style obsolete or, rarely, to 0.5 mm.

brown, 3–5 × 1.7–2.2 mm;

wing to 0.7 mm wide.