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Genus Anthemis in Tribe Anthemideae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

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Genus Description

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Anthemis L. belongs to the tribe Anthemideae in Asteraceae and includes about 180 accepted species (POWO, 2024). The genus is centred in the Mediterranean, extending through Europe, North Africa and western Asia, and has become naturalised in parts of North America and Australia. Anthemis arvensis L. serves as the lectotype for the group.

Plants are herbaceous annuals or short‑lived perennials, often forming basal rosettes and erect stems. Leaves are alternate, finely divided or pinnately lobed, sometimes glandular. Heads are solitary, long‑pedunculate, with conspicuous yellow ray florets surrounding a dense disk of bisexual florets. Receptacles are convex and scaleless; involucral bracts form several rows. The fruit is an obovoid cypsela, usually lacking a pappus or bearing a minute crown (WFO, 2024).

Species richness peaks in the eastern Mediterranean, particularly the Levant, Anatolia and the Balkans, where many narrow endemics inhabit limestone cliffs, alpine meadows and coastal dunes (Stace, 2010). The genus occupies dry open habitats from sea level to around 2 500 m in ranges such as the Taurus and Pyrenees, and displays a Mediterranean‑Irano‑Turanian disjunct distribution with taxa reaching the Caucasus and Central Asia (Ortiz et al., 2020).

Pollination is mainly by bees, flies and butterflies; the showy ray florets attract visual foragers while the tubular disk florets provide nectar (Stace, 2010). Achenes fall near the parent plant and are dispersed by gravity and short‑distance wind. Chromosome counts are based on x = 9, with most species diploid (2n = 18) and occasional tetraploids (Bremer & Humphries, 1993).

Historically, Anthemis has been divided into informal sections such as Euanthemis and Pavonia, but molecular phylogenies (Ortiz et al., 2020) place Cota and Otanthus within the Anthemis crown, supporting a monophyletic genus. Consequently, some authors retain Cota as separate (Bremer & Humphries, 1993), whereas others merge it into Anthemis (WFO, 2024). This split reflects unresolved relationships among Mediterranean‑Asian subclades and calls for a unified taxonomic framework.

Anthemis tinctoria (golden marguerite) and A. cotula are cultivated as ornamental garden plants for their bright, long‑lasting blooms. A. arvensis and A. cotula act as agricultural weeds, reducing yields in cereal fields. The genus supplies occasional natural dyes from dried flower heads but no timber.

Hydrological alteration, over‑grazing and urban encroachment threaten many Mediterranean Anthemis endemics, while unresolved taxonomy hampers effective protection (POWO, 2024). Ongoing integrative research that unites molecular data, field surveys and ex situ cultivation will be vital to safeguard the genus's future diversity.

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