Flora of North America species comparison

arising at slightly different heights, not forming just 1 rosette, green, ternate-2–3-pinnate or quinate-2–3-pinnate;

petiole sheathing basally to entire length;

blade rhombic or widely obovate, 6–20 × 6–18 cm, surfaces glabrous;

primary leaflets much divided; ultimate segments 400–1000, linear, 10–50 × 1–5 mm, relatively narrow, crowded, confluent at base with adjacent lobe, petiolule absent, margins entire, usually not reflexed, apex acute, callus tips 0–0.1 mm, terminal segment 17–24(–27) mm;

cauline leaves 0–2, if present, with more than 5 ultimate segments.

absent.

1–30 per plant, 1 per stem, ascending or erect, not inflated, 20–80 cm, exceeding leaves, 2.5–6 mm wide 1 cm below umbel, glabrous.

4.5–8.3 cm wide in flower, 11.5–25 cm wide in fruit, rays 13–25, fertile rays 8–15, spreading, 6–11 cm in fruit, unequal, glabrous;

involucel bractlets (3–)4–7(–9), distinct, linear, to 11 mm, equaling or exceeding flowers, margins scarious, not ciliate, entire, glabrous.

petals yellow, glabrous;

anthers yellow;

ovary and young fruit glabrous.

6–13 mm, shorter than fruit, spreading to erect when fruit is mature.

dorsiventrally compressed, linear-oblong, 20–32 × 5.8–9.5 mm, length/width ratio 2.2–2.9;

wings 2–3.2 mm wide, 45–70% of body width, paler than body;

abaxial ribs raised and narrowly winglike;

apex usually obtuse, rounded, or truncate;

oil ducts 1(–4) in intervals, 2 on commissure.

= 66