Herbs strongly blue-green, caulescent, 20–60 cm, glabrous; caudex simple, with or without persistent leaf sheaths weathering into a few fibers or sparsely chartaceous thatch, without persistent peduncles; taproot thick. Pseudoscapes absent. Leaves arising at slightly different heights, not forming just 1 rosette, blue-green, ternate-2-pinnate-1-(weakly) pinnatifid; petiole sheathing basally; blade rhombic to narrowly triangular, 4–45.5 × 1–30 cm, surfaces glabrous; ultimate segments 1000+, rhombic or broadly elliptic, 1–5.2 × 0.4–2.1 mm, margins entire or with very fine triangular scabrosities (20×), apex acute to obtuse or rounded, not distinctly attenuate, short-apiculate or blunt; cauline leaves 0–2. Peduncles 1–15 per plant, per stem, spreading-ascending to erect, not inflated, (12.5–)18–42(–62.5) cm, exceeding leaves, 4–7 mm wide 1 cm below umbel, glabrous. Umbels 3–8 cm wide in flower, 8–10 cm wide in fruit, rays (6–)12–20(–24), spreading-ascending, 1.8–5.5 cm in fruit, unequal, glabrous; involucel bractlets (2–)3–8(–10) distinct, linear, broad, (0.7–)2–6(–7.4) mm, shorter than flowers, margins not scarious, not ciliate, entire, glabrous. Fruiting pedicels (3.8–)5.3–8.3(–9.3) mm, shorter than fruit. Flowers: petals yellow with irregular reddish wash distally, glabrous; anthers yellow; ovary and young fruit glabrous. Mericarps dorsiventrally compressed, oblong to narrowly elliptic, (11–)13.7–16.3(–17) × 4.5–5.9, length/width ratio 2.2–3.2; wings 0.5–0.8 mm wide, 10–20% of body width, ± same color as body, not corky thickened; abaxial ribs obscure, not raised; apex obtuse or rounded; oil ducts 2–8 in intervals, 6–16 on commissure, 1–2 on each wing.