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Genus Pericallis in Tribe Senecioneae

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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Pericallis D.Don, a Canary Islands endemic, belongs to Asteraceae (tribe Senecioneae) and comprises about 13 species of perennial herbs and subshrubs (POWO, 2024; WFO, 2024; Valdés et al., 2015). The species occur predominantly in laurel and Monteverde forests and clearings, with one variety reaching scrub communities on cliffs. Pericallis cruenta (L’Hér.) D.Don is the widely cultivated ornamental, and it is the lectotype of the genus (The International Plant Names Index, 2012).

Diagnostic morphology separates Pericallis from closely related Madeiran and African taxa by a combination of soft indumentum, often amplexicaule leaf bases, radiate capitula with usually yellow to white rays (purple to magenta in horticultural forms), heterogamous florets, anthers with long appendages, and achenes with a pappus of soft bristles (Valdés et al., 2015). Leaves are alternate, simple, often ovate to orbicular and cordate at the base; the inflorescence is cymose to corymbose, bearing capitula with a prominent involucre of distinct phyllaries and short outer bracts. The ovary is inferior with a single basal ovule.

Diversity and range centre on the Macaronesian archipelago, with a mixed pattern of species radiations across islands and elevations. Most taxa are restricted to single islands, many confined to laurel forest understories or cloud-scrub at mid-altitudes, but some extend into coastal or cliff habitats; secondary introductions are occasional on Tenerife and La Palma (WFO, 2024). Biogeographically, the genus aligns with other Canary Island senecionoids that exhibit island colonisation and local speciation (Mort et al., 2002; Pelser et al., 2007).

Intrinsic biology reflects typical Senecioneae syndromes: capitula attract insects consistent with melittophily, and seeds are wind-dispersed by pappus, facilitating colonisation within and among islands (Norden et al., 2009). Life history is perennially herbaceous to weakly woody, with many species sprouting from woody caudices in fire-prone or cloud-influenced habitats (Valdés et al., 2015). Chromosome base number in the allied Cineraria complex has often been reported as x=30, but counts specifically for Pericallis are uneven and citations are inconsistent, so the number remains tentative.

Taxonomy and phylogeny place Pericallis within the “Cineraria group” of tribe Senecioneae, a clade characterised by herbaceous habit, pappus, and heterogamous capitula (Pelser et al., 2007). Modern treatments recognise Pericallis as Canary Island-endemic and segregate it from African Cineraria, whereas earlier flora treatments conflated the two; such generic boundaries remain debated (POWO, 2024; WFO, 2024; Morton & Swaminathan, 1969). Segregate subgeneric or sectional ranks have seldom been used in recent references, although species clusters correspond to island lineages (Valdés et al., 2015).

Human relevance centres on horticulture: the common “cineraria” grown as bedding and greenhouse ornamentals derives from Pericallis cruenta and related Canary Island taxa, yielding showy purple, magenta, or pink radiate heads; the wild species are occasionally cultivated by specialist collectors. There are no major timber, crop, or invasive impacts reported for Pericallis sensu stricto.

Conservation and outlook reflect global pressures on Canary laurel forests and cliff habitats from invasive species, grazing, and climate-driven drought (Valdés et al., 2015). Critical research gaps remain in species-level distribution and long-term population dynamics (GBIF, 2024).

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