Rather stout; stems stiff, striate, up to ± 4 dm. long; stock stout. Lvs 2-3-pinnate, on petioles up to ± 15 cm. long; sheath 2-3 cm. long narrowed to apex; ligule 0 or obscure. Lamina (10)-15-20-(30) × 5-10-(15) cm.; narrow-oblong in outline. Primary pinnae 6-10 pairs. 4-7 × 3-5 cm.; secondary ± 2 × 1·5-2 cm.; tertiary pinnae or segs narrow-linear to filiform, (0·5)-1-2-(3) cm., rather distant, acicular. Umbels compound, us. several paniculately arranged. Primary rays unequal, slender, up to c. 3 cm. long; involucral bracts several, linear, acuminate, ± 5-10 mm. long. Secondary rays very short, ± = involucral bracts; umbellules ± 5 mm. diam. Fr. 3-4 mm. long; styles not >1 mm. long; mericarps with 5 narrow wings.
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