Fruit c. 9 × 5 mm., obovate, strongly dorsally compressed; calyx teeth obsolete; stylopodium conical with somewhat lobed base; styles 1·5 times as long as the stylopodium, tending to fall in fruit. Fruit wings well developed and forming a notch in which the stylopodium is situated at maturity. Dorsal ridges filiform.
Inflorescence of terminal and lateral compound umbels. Rays 7–14, subequal; bracts 0-several, small, linear and inconspicuous. Partial umbels with 10–20 flowers, mostly hermaphrodite but sometimes with a small group of male flowers at the centre; bracteoles 0-few, similar to the bracts; pedicels relatively robust.
Petiole and rhachis with hairs similar to those on the stem; superior surface of the leaflets with scattered, short, fine appressed hairs; inferior surface nearly glabrous with a few hairs on the veins only; margin with a fringe of short spreading hairs.
Stem terete, solid, rather coarsely striate with clearly marked ridges, often purplish especially near the base, covered with numerous short, erect bristly hairs some of which are glandular; the base covered with fibrous remains of old leaf bases.
Leaves up to 30 × 7 cm., simply pinnate, mostly basal, with 3–7 pairs of ovate-deltate leaflets and 1 terminal one.
Leaflets jaggedly cut and toothed, sometimes nearly reaching the midrib; teeth ending in a short hyaline mucro.
Leaves sheathing at the base; petiole approximately 1/3 the total length of the leaf.
Perennial or biennial herbs with fleshy to woody taproots, up to c. 1 m. tall.
Vittae 1 in each interval and 2 in the commissural face.
Petals white, the outer ones more or less radiate.
Carpophore deeply 2-cleft.