Tripleurospermum inodorum Sch.Bip.

Almost scentless, annual or biennial herb sometimes regrowing from old rootstock. Stems erect or ascending, 15–100 cm tall, ribbed, usually glabrous, sometimes sparsely hairy, branched only above to form infl. or sometimes also much-branched from base. Basal and lower cauline lvs appearing shortly petiolate, but usually with very reduced leaflets along sheath, usually narrow-obovate, sometimes ovate, glabrous, mostly 3-pinnatisect, 15–150 × 10–60 mm; ultimate segments filiform, entire, not all in one plane giving a feathery appearance; cauline lvs similar to basal, but apetiolate and above becoming smaller and with fewer segments. Corymb diffuse, of few to many capitula. Involucral bracts glabrous or with a few scattered hairs, 4–7 mm long; margins pale or dark brown, membranous. Capitula c. 30–50 mm diam.; ray florets 12-numerous; ligules white; disc florets numerous, yellow. Achenes 1.7–2.5 mm long, brown, narrow-obpyramidal to cylindric; inner surface with 3 thick ribs; outer surface rugose, with 2, ± globose or slightly elongated glands at apex; corona crenulate, c. 0.1 mm long.

[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]

Flowering: (Aug.)–Jan.–Feb.–(May)