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Genus Leucanthemum 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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Leucanthemum (Mill.) belongs to Asteraceae, subfamily Asteroideae, tribe Anthemideae (APG IV, 2016). The genus comprises roughly 70 accepted species worldwide (POWO, 2024; WFO, 2024), native to temperate Eurasia and North Africa, with many in open grasslands and montane habitats. The type species is Leucanthemum vulgare (Lam.) (POWO, 2024).

Plants are herbaceous perennials forming basal rosettes; stems are erect and usually unbranched. Leaves are alternate, often pinnately lobed, with serrate margins and a glabrous to sparsely glandular indumentum. Capitula are solitary or in loose corymbs, each with 15–30 white ray florets surrounding a yellow disc; the involucres have several imbricate rows of phyllaries and the receptacle is flat to convex. The achenes are ribbed and lack a pappus, a key character separating Leucanthemum from many Anthemideae (Anderberg et al., 2020).

Species richness peaks in the Mediterranean basin, with endemics in the Iberian Peninsula, the Balkans, and the Caucasus. Habitats span low‑elevation calcareous grasslands to alpine meadows up to 3000 m. Leucanthemum vulgare is naturalised beyond its native range, while L. paludosum occurs only on high‑mountain rock outcrops. The disjunct pattern reflects both vicariance and long‑distance dispersal.

The genus is mainly entomophilous, pollinated by bees, flies and lepidopterans. Achenes lack a pappus and are dispersed by gravity and short‑range animal movement. Chromosome data consistently show a base number of x = 9, with many diploids at 2n = 18 and occasional tetraploids (Anderberg et al., 2020).

Phylogenetic studies place Leucanthemum as monophyletic within the core Anthemideae (Anderberg et al., 2020). Some authors recognize two informal clades (the ‘vulgare’ and ‘pallidum’ clades), whereas others adopt a broader circumscription that includes former Chrysanthemum species (Greuter, 2008). Recent treatments have synonymised several Mediterranean taxa, reducing the former count of >100 species to the current accepted ~70 (POWO, 2024; WFO, 2024).

Several species, especially L. × superbum (the Shasta daisy), are widely cultivated for borders and cut‑flower markets. L. vulgare appears in meadow seed mixes but can become invasive in non‑native grasslands. No Leucanthemum species are used as timber or food.

Although many taxa are secure, several narrow endemics face habitat loss due to agricultural intensification and tourism, and their Red List assessments remain incomplete. Continued integrative research that combines phylogenomics, population genetics and ecological data is essential for refining species limits and guiding conservation actions.

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