Flora of North America species comparison

arising at slightly different heights, not forming just 1 rosette, green with slight bluish tone, openly ternate-, sometimes quinate-, 1–2-pinnate or -pinnatifid-pinnatifid;

petiole sheathing basally to entire length;

blade triangular or rhombic, 5–8 × 5.1–20.7 cm, surfaces finely hirtellous; ultimate segments (30–)50–120, linear or narrowly elliptic, crowded, confluent at base with adjacent lobe, 4–30 × 0.5–2 mm, most longer than 6 mm, relatively narrow, margins entire, usually not reflexed, apex acute, callus tips 0–0.2 mm, terminal segment 13–24(–27) mm;

cauline leaves 0.

subterranean.

1–6 per plant, 1 per stem, curved-ascending or nearly erect, not inflated, 9–25 cm, exceeding leaves at least in fruit, 0.9–2 mm wide 1 cm below umbel, hirtellous.

2.3–10.2 cm wide in flower, 4.6–8.5 cm wide in fruit, rays 9–26, ascending to spreading, longer ones 4–6 cm in fruit, unequal, hirtellous;

involucel bractlets (0–)3–9(–17), slightly connate basally, linear-attenuate, 2.5–5 mm, subequal to flowers, margins narrowly scarious, not ciliate, entire, glabrous.

petals yellow, glabrous;

anthers yellow;

ovary and young fruit glabrous or sparsely spreading-hirtellous.

3–7 mm, shorter than fruit, spreading to erect when fruit is mature.

dorsiventrally compressed, broadly linear to elliptic, 8–9.7 × 3.1–4.5 mm, length/width ratio 1.7–2.1;

wings 0.8–1.8 mm wide, 45–55% of body width, paler than body;

abaxial ribs slightly or prominently raised;

apex rounded or truncate;

oil ducts 1 in intervals, 4–6 on commissure.