Plants 25–30 cm, roots cylindric. Stem erect, 4–5 mm thick, often violet at base. Basal leaves petiolate, petioles 8–10 cm, glabrous; blade rhomboid in outline, 6–12 × 6–12 cm, 3–4-pinnate, primary pinnae petiolate, but distal sessile; ultimate segments rhomboid or ovate ca. 6–10 mm, margin pinnate, dentate or lobed on each side. Upper leaves few (1–2), similar to basal, but reduced. Umbels 6–10 cm across; bracts 6–10, ca. equaling rays, 1–2-pinnate, pilose; rays 12–26, unequal, 4–9 cm, pilose; bracteoles numerous, filiform, entire or 2-lobed, 2–3 × umbellules, reflexed, pilose. Petals deep violet, 1.2–2.3 mm. Fruit 6–6.5 × 3.5–4 mm. Fr. Sep.
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