Flora of North America species comparison

simple from base, erect, branched distally, (3.5–)4.5–16(–18) dm.

simple or several from base, erect to ascending or (outer ones) decumbent, unbranched or branched, 0.2–1.5(–3.8) dm.

(soon deciduous), not rosulate;

petiole (1–)2–5.5(–7.5) cm;

blade pinnatifid, (2–)3–6.8(–9) cm × 10–30 mm, margins (of lobes) dentate to serrate.

(soon withered);

not rosulate;

petiole often undifferentiated (to 3 cm);

blade linear, 2–10 cm × 1–4 mm, margins entire, dentate, or pinnatisect (lobes 2–10 pairs, margins entire or dentate).

shortly petiolate or sessile;

blade narrowly lanceolate or oblanceolate to linear, 3–7 cm × (2.5–)4–10mm (smaller distally), base attenuate to cuneate, not auriculate, margins usually entire, rarely dentate.

similar to basal, smaller, blade base attenuate, not auriculate, margins entire.

elongated in fruit;

rachis puberulent, trichomes straight or curved.

(subcapitate to cylindrical), elongated or not in fruit, (compact);

rachis puberulent, trichomes straight, cylindrical.

sepals suborbicular to oblong, 0.8–1.5 × 0.7–1.2 mm;

petals white, suborbicular, 2.2–3.5(4) × 1.5–2.5 mm, claw 0.7–1.5 mm;

stamens 6;

filaments 1.5–2.5 mm, (glabrous);

anthers 0.3–0.4 mm.

sepals (somewhat persistent), ovate, 1.1–1.4 × 0.6–0.8 mm;

petals greenish, obovate-oblong, 1.9–3 × 0.8–1.3 mm, claw absent, (usually pubescent outside, with fringed margin, rarely glabrescent);

stamens 4, median;

filaments 0.8–1.1 mm;

anthers 0.15–0.2 mm.

divaricate-ascending to horizontal, usually slightly recurved or somewhat sigmoid, rarely straight, (not winged), (3–)3.5–7.5(–8) × 0.2–0.3 mm, puberulent adaxially.

erect to slightly ascending, straight and appressed to rachis or distally slightly recurved, (strongly flattened), 2.5–5 × 0.9–1.4 mm, usually puberulent throughout, rarely only adaxially.

broadly ovate, 2–3.5(–4) × 1.8–2.6(–3) mm, apically winged, apical notch 0.1–0.2mm deep;

valves thin, smooth, not veined, glabrous;

style (0.2–)0.3–0.6(–0.7) mm, exserted beyond apical notch.

oblong-ovate, 5–7 × 2.8–4 mm, apically winged, apical notch 1.4–2.8 mm deep;

valves thick, smooth, strongly reticulate-veined, hirsute and puberulent, (trichomes spreading, mixed with smaller ones);

style obsolete, included in apical notch.

(dark brown), ovate, 1.4–1.8 × 0.8–1.1 mm.

oblong, 2–2.4 × 1.1–1.3 mm.