Leaves petiolate, petioles 3–8 cm, pubescent; blade oblong or oblong-ovate, 3–10 × 1.5–4 cm, 2–3-pinnate; pinnae 3–4 pairs; ultimate segments linear to linear-lanceolate, 4–7(–13)× 0.75–1 mm. Bracts absent; rays numerous, arising from caudex, 3–6 cm, hispid; bracteoles 4–6, linear, entire, or apex 2–3-lobed; umbellules 18–25-flowered; pedicels 2–3 mm. Petals white, occasionally tinged purple. Styles 1.75–3 mm after flowering. Fruit suborbicular, 4–5.5 × 4–5 mm; lateral ribs broadly winged, dorsal ribs narrowly winged, wings often poorly developed and often reduced to aborted structures at base. Fl. Aug–Sep, fr. Sep–Oct.
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