Umbels on 2–14 cm. peduncles; rays 5–10(–25), slender, 1–7 cm., glabrous; involucre conspicuous, of 4–10 bracts which are broadly pale-margined below, entire or usually trisect or pinnate above, 0.8–1.6 cm., finally deflexed; partial umbels ± 10–28-flowered, pedicels glabrous, ± 2–8 mm.; involucel of 5–8 broadly elliptic, acute to acuminate, broadly pale-margined, finally deflexed, 3–5 mm. bracteoles.
Sepals very small, sometimes not discernible.
Petals cream or white to greenish-yellow, 0.75–1 mm.
Fruit broadly ovoid, ± 2.5 × 2 mm., glabrous, blackish or dark red, the mericarps sometimes gaping centrally at the commissure when ripe, ribs narrow but pale and prominent; stylopodia large, shortly conical, subequalled by the rather rigid, ± divergent styles.
Glabrous perennial herb 22–100 cm. tall, with a thickened, dark, woody rhizome sending out numerous fibrous roodets and occasionally hypogeal stolons.
Stem fistular, strongly ridged and sulcate, with generally few, slender, long, ascending branches.
First leaves generally of a single oblong to elliptic leaflet with 1–2 pairs of rudimentary lower leaflets, other lower leaves with an increasing number of leaflets; main lower leaves linear-oblong in oudine, up to 70 cm. long but generally less, simply pinnate with 16–32(–40) pairs of firm, roundish to oblong, flabellate or linear-falcate, ± 5–20 × 3–15 mm. leaflets; leaflets denticulate with broad-based teeth ± abruptly narrowed to a sharp, commonly whitish cartilaginous mucro, the lowest on the fistular rhachis often reduced and rudimentary; sheaths striate, narrowed above, membranous-margined, 0.8–2.5 cm.; petiole 0.6–5 cm.; upper leaves rapidly reduced, becoming very small, sessile, with 2–4 pairs of mucronate to subaristate segments.