Lax perennial herb with much-branched slender spreading stems up to c. 6 dm. long. Lvs pinnate to 2-pinnate, on slender petioles up to c. 15 cm. long. Lamina ovate-oblong in outline; lflts in few pairs, on very slender petiolules up to 15 mm. long; lflts of basal lvs up to 15 × 20 mm., us. less, coarsely apiculately toothed, cuneately narrowed to base; pinnules of cauline lvs and often of basal ones ± 10 × 5 mm., very membr., on filiform petiolules 2-5 mm. long, pinnatifid to pinnatisect; segs linear to narrow-lanceolate, ± apiculate. Umbels on very slender peduncles up to ± 25 cm. long. Involucral bracts several, linear to linear-lanceolate, apiculate, up to c. 5 mm. long. Rays 10-15, unequal, very slender, up to c. 2 cm. long. Fr. glab. to pubescent, linear or very slightly widened towards base, ± 5-6 mm. long, strongly ribbed.

n = 6

2n = 12

2n = 12

n = 6