Flora of North America species comparison

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

few to several from base, erect to ascending, or (outer ones) decumbent, unbranched, (0.15–)0.3–1.3(–2.1) 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 0.5–2 cm;

blade pinnatifid to pinnatisect (lobes linear to narrowly oblong), (1.5–)2.2–5.7(–7) cm × (0.5–)1–2(–3) mm, margins entire.

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.

sessile;

blade usually linear, rarely with linear lobes, 1–5 cm × 0.5–2 mm, base attenuate, not auriculate, margins entire.

elongated in fruit;

rachis puberulent, trichomes straight or curved.

elongated, (dense) in fruit;

rachis hirsute, 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 oblong to ovate, 0.7–1.1 × 0.2–0.6 mm;

petals absent;

stamens 4, median;

filaments 0.5–1 mm;

anthers ca. 0.1 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), (1.6–)1.9–2.5(–3) × 0.4–0.8 mm (width proximal to apex), usually hirsute or, 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.

ovate, 2.5–3.5 × 2–2.8 mm, apically winged, apical notch (closed, often U-shaped), 0.5–0.7(–0.8) mm deep;

valves thin, smooth, strongly reticulate-veined, usually hirsute, rarely glabrous;

style absent or obsolete, included in apical notch.

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

ovate, 1.2–1.8 × 0.8–1.2 mm.