Flora of North America species comparison

ascending to erect, (1.8–)2–6(–6.5) dm.

7–25(–30) cm; sheathing base usually sparsely strigose abaxially;

petiole 1–4(–5) cm;

leaflets 15–40 per side, ± flabellate, 3–14 mm, usually incised to base into 2–3 oblanceolate lobes, ± densely short-hirsute to -villous.

10–60-flowered, 4–15 cm diam.

(1–)5–20 mm.

9–14 mm diam.;

epicalyx bractlets lanceolate, 1–3(–3.3) mm;

hypanthium interior golden, 1–2 × 3–5 mm;

sepals (2.5–)3.5–6 mm, base golden adaxially, apex acute to acuminate;

petals yellow, linear to narrowly oblanceolate, 2–4 mm;

stamens 5, filaments 2–4 mm, anthers yellow, sometimes red-rimmed, oblong, 0.6–1.2 mm;

carpels 1–5, styles 2–3 mm.

brown, 1.7–2.2 mm.