Tanacetum L.

Ghazanfar, S. A., Edmondson, J. R. & Hind, D. J. N. (Eds). (2019). Flora of Iraq, Volume 6: Compositae.Kew Publishing

Morphology General Habit

Perennial herbs, rarely subshrubs

Morphology General Indumentum

Indumentum absent or hairs basifixed or sometimes stellate (not in Iraq plants)

Morphology Leaves

Leaves alternate, 1–3-pinntipartite, rarely entire

Morphology Reproductive morphology Inflorescences Capitulum

Capitula solitary or in corymbs, heterogamous and radiate or disciform, or homogamous and discoid

Morphology Reproductive morphology Inflorescences Bracts Involucre

Involucre campanulate; phyllaries in 3–5 rows, margins broad or narrow, scarious, usually brown

Morphology Reproductive morphology Flowers Receptacle

Receptacle flat to hemispherical, epaleate, usually pilose

Morphology Reproductive morphology Flowers Florets

Marginal florets female, fertile or neuter; ray limb white, yellow (in Iraq plants) or pink; disk florets bisexual;corolla yellow, tubular, apex 5-lobed or 5-toothed

Morphology Reproductive morphology Fruits

Achenes terete or obscurely 3-angled, 5–10(–15)-ribbed; apex marginally rounded or with corona present, rarely with an adaxial auricle; pericarp without myxogenic cells.

Distribution

A genus of about 160 species in N Africa, C Asia, Europe; some species widely cultivated. 9 species in Iraq.