Perennial herb to 50 cm tall, hairy. Stems erect, branched. Leaves 2 or 3 times divided, to 12 cm long, primary segments to 2.5 cm long and oblong, petiolate. Capitula many in dense corymbs, to 2.5 cm across; summer. Ray florets white. Achenes about 1mm long. Pappus a toothed crown. [Pyrethrum ptarmiciflorum Webb & Berthel., Chrysanthemum ptarmiciflorum (Webb) Brenan]

Canary Islands

Also spelt T. ptarmicaeflorum.

Source: Lawson, L.; Spencer, R. (2002). Dahlia. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.