Flora of North America species comparison

few to several from base, erect to ascending or decumbent, branched distally, 1–4.5(–7) dm.

few to several from base, erect to ascending, or (outer ones) decumbent, unbranched, (0.15–)0.3–1.3(–2.1) dm.

(soon withered);

not rosulate;

petiole 0.5–4(–6) cm;

blade 1- or 2-pinnatisect, 1–6(–8) cm, margins (of lobes) entire or dentate (sometimes deeply lobed).

(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 to subsessile;

blade similar to basal, smaller and less divided distally, lobes lanceolate to oblong or elliptic, 1.5–3.5(–4.5) cm ×5–12 mm, base not auriculate, margins (of lobes) entire, serrate, or incised.

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 glabrous or pubescent, trichomes straight, cylindrical.

elongated, (dense) in fruit;

rachis hirsute, trichomes straight, cylindrical.

sepals (tardily deciduous), ovate, 0.5–0.7(–0.9) mm;

petals white, elliptic to linear, 0.4–0.5 × ca. 0.1 mm, claw absent;

stamens 2, median;

filaments 0.3–0.6 mm;

anthers 0.1–0.2 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 to horizontal, straight slightly recurved, (terete), 1.4–2.5(–4) × 0.15–2 mm, glabrous or sparsely pubescent 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.

schizocarpic, didymous, 1.3–1.7 × 2–2.5 mm, apically not winged, apical notch 0.2–0.4 mm deep;

valves thick, rugose, strongly veined, glabrous;

style absent or obsolete, included in 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.

ovate, 1–1.2 × 0.7–0.8 mm.

ovate, 1.2–1.8 × 0.8–1.2 mm.

= 32.