Flora of North America species comparison

decumbent to erect, 0.3–3 dm.

ascending to erect, (1–)1.5–4 dm.

tightly to loosely cylindric, 1–15 cm; sheathing base glabrous abaxially;

petiole 0.5–4 cm, hairs 0.2–1 mm;

leaflets 10–35 per side, 1–8 mm, glabrous or short-hirsute, minutely glandular, lobes (2–)4–8(–10), linear to obovate or ± orbiculate, apex sometimes setose.

mousetail-like (individual leaflets scarcely distinguishable), 3–10 cm; sheathing base densely strigose abaxially;

petiole 0.5–1.5 cm;

leaflets 60–80 per side, 0.6–1.5 mm, lobes (0–)3–5, obovate to oval, densely villous.

0–2(–3), not paired.

3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.;

glomerules usually 1.

(10–)30–200-flowered, 3–8(–30) cm diam.

(0.5–)1–7(–11) mm.

5–30 mm.

6–12 mm diam.;

epicalyx bractlets oblong to oval, 0.8–2.5(–3) mm;

hypanthium shallowly cupulate, 1–2 × 2.5–5 mm;

sepals (1.8–)2–4(–4.5) mm, obtuse to acute;

petals golden yellow, obovate, 2–5 mm;

stamens 5, filaments 0.8–2 mm, anthers yellow, 0.6–0.8 mm;

carpels (5–)8–15(–18), styles 1–3 mm.

5–8 mm diam.;

epicalyx bractlets oblong to broadly ovate or orbiculate, 0.2–0.5 mm;

hypanthium 0.5–1.5 × 2–3 mm;

sepals 1–2 mm, apex obtuse to acute;

petals white, broadly obovate to orbiculate, 2–2.5 mm;

stamens 15, filaments 1.2–1.8 mm, anthers purple, broadly obcordate to pouch-shaped, 0.3–0.4 mm;

carpels 1, styles 2–3 mm.

greenish tan to light brown, 1.2–1.5 mm.

mottled grayish brown, 1.7–2 mm.

= 28.