Flora of North America species comparison

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

usually few to several, rarely simple from base, erect to ascending or (outer ones) decumbent, branched distally, (0.15–)0.6–3(–3.8) dm.

(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.

(later withered);

not rosulate;

petiole (0.4–)1–3.5(–5) cm;

blade spatulate to oblanceolate, lyrate-pinnatifid, pinnatisect, or 2-pinnatifid, (0.7–)1.5–4.5(–7.5) cm × (9–)12–20(–30) mm, margins rarely dentate, (lobes) entire or dentate.

sessile;

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

subsessile or petioles 0.8–2.2 cm, blade lanceolate to oblanceolate, (0.7–)1.2–3.3(–5) cm × (2–)4–12 mm, base cuneate, not auriculate, margins subentire to dentate.

elongated, (dense) in fruit;

rachis hirsute, trichomes straight, cylindrical.

often considerably elongated in fruit;

rachis hirsute or hispid, trichomes straight, cylindrical.

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.

sepals oblong, 1–1.3(–1.5) × 0.5–0.8mm;

petals (sometimes absent), white, oblanceolate to linear, (0.3–)0.6–1.5(–2) × (0.1–)0.2–0.5 mm, claw absent;

stamens 2, median;

filaments 1–1.4 mm;

anthers 0.2–0.3 mm.

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.

divaricate-ascending to horizontal, straight or slightly curved, (often strongly flattened), (1.8–)2–4(–4.6) × 0.2–0.7 mm (to 0.3 mm thick), hirsute to hispid throughout or adaxially.

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 to ovate-orbicular, 2.8–4(–4.6) × 2.4–3.6(–4) mm, (base broadly cuneate to rounded), apically winged, apical notch (0.2–)0.3–0.6(–0.7) mm deep;

valves thin, smooth, not veined, hirsute to hispid (on surface or margin);

style obsolete or to 0.1 mm, included in apical notch.

ovate, 1.2–1.8 × 0.8–1.2 mm.

ovate, 1.4–2.2 × 0.9–1.4 mm.