Stems stout to rather slender, striate, up to c. 5 dm. tall; lamina narrow-oblong in outline, up to ± 20 cm. long, on petiole up to ± 10 cm. long; pinnae 5-10 pairs, flabellate to rhomboid in outline, distant, submembr., on petiolules up to ± 5 mm. long, or subsessile. Lamina of pinnae ± 20 × 25 mm., very deeply irregularly 3-(5)-lobed; lobes again deeply divided; final segs about oblong, rather abruptly narrowed to stiff hair-process. Umbel-bearing portion of stem very slender; bracts up to ± 2 cm. long, including delicate sheath and small lamina. Umbels compound, on slender peduncles up to c. 8 cm. long. Primary rays unequal, 5-10, very slender, up to 3 cm. long; involucral bracts few, filiform, secondary rays very short, up to 15. Umbellules c. 5-10 mm. diam. in fl.