Flora of North America species comparison

usually ± erect, sometimes nearly prostrate, 0.5–1.5(–2) dm.

ascending to erect, 2–6 dm.

very tightly cylindric (mousetail-like, with individual leaflets scarcely distinguishable), 2–5(–10) cm; sheathing base densely strigose abaxially;

petiole 0.2–0.8(–1) cm, hairs 0.5–1.5 mm;

leaflets 25–40 per side, 0.4–1 mm, densely sericeous, glands obscured, lobes 2–5, obovate or oval to orbiculate, apex not setose.

6–25(–30) cm; sheathing base minutely glandular abaxially;

petiole 0.5–8(–10) cm;

leaflets 12–30 per side, obovate to broadly cuneate, 5–12(–15) mm, incised 1/3–1/2 to base into 3–5 oblong to ovate teeth, sometimes entire, sparsely short-strigose to -villous, sometimes glabrate.

(0–)1–2, paired if 2.

10–30-flowered, 1–2(–3.5) cm diam.;

glomerules usually 1.

(5–)8–60-flowered, 2–12 cm diam.

0.3–2(–3.5) mm.

5–30(–35) mm.

5–6 mm diam.;

epicalyx bractlets oblong to obovate, 0.5–1 mm;

hypanthium shallowly cupulate, 0.5–1(–1.5) × 1.5–2.5 mm;

sepals (1–)1.5–2.5 mm, acute;

petals yellow, linear to oblanceolate or narrowly oblong, 1–2 mm;

stamens 5, filaments 0.3–0.6 mm, anthers yellow, 0.4–0.6 mm;

carpels 1–4, styles 0.7–1.2 mm.

9–12 mm diam.;

epicalyx bractlets narrowly lanceolate to lanceolate, 1–2 mm;

hypanthium interior brick- to blood-red or golden, 0.5–1.5 × 3–5 mm;

sepals 3–4.5 mm, base brick- to blood-red adaxially, apex acute to acuminate;

petals brick- to blood-red, linear to oblanceolate or narrowly elliptic, 2–3.5 mm;

stamens 5, filaments 1.3–2 mm, anthers maroon, oblong, 0.6–0.9 mm;

carpels 1–5, styles 2–3 mm.

grayish brown, mottled with red, 1.6–2 mm.

brown, 2–2.5 mm.

= 28.