Perennial ± aromatic herb (smell of Foeniculum), 0.6–1.8(–3) m. tall, usually in considerable stands of single stems.. Stems simple or with a few branches near the top, rigid, 3–8 mm. wide, green to purplish, glabrous, terete, finely striate, with a soft pith.. Leaves flabellate to broadly deltoid in outline, glabrous, at centre of stem ± 8–15 cm. long and usually at least as broad, tripinnate into subacicular (1–)2.5–11 cm. × ± 1 mm. segments, segments with thickened and ± recurved margins and tipped with a firm, pale or reddish mucro, lamina sessile on the sheaths; sheaths very long, 4.5–7.5 cm., narrowly oblong, glabrous, with deep rounded auricles at the apex on each side of the basal pinnae; uppermost leaves rapidly reducing but these small leaves usually few.. Umbels solitary to rather few, peduncles 4–8 cm., glabrous, terete; rays ± 14–30, densely tomentose, ± 1–5.5 cm. long; involucre conspicuous, of ± 7–9 narrowly oblong bracts ± 2–4.5 × 0.4–0.6 cm., nervose, pale-margined, glabrous or ciliate to tomentose, rather rapidly finely acuminate, entire to denticulate or subfimbriate at the apex; flowers ± 16–28 in each partial umbel, on tomentose pedicels 1.5–6 cm. long; involucre of ± 7–10 bracteoles similar to bracts, ± 8–17 mm. long; rays and pedicels somewhat thickened and rigid, drawing together or ± incurved in fruit.. Calyx-teeth obsolete.. Petals white to pale yellow, ± 1–1.25 mm., tomentose dorsally.. Fruit oblong-elliptic, ± 4 × 2.5 mm., densely shortly tomentose; stylopodia shorter than to subequalling the ± 1–2 mm., glabrous, divergent styles.
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A robust herb up to 6 ft. high
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