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Genus Arum in Family Araceae

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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The genus Arum (family Araceae) is a temperate Eurasian–North African group with about 30 species (Boyce, 2006; Boyce & Bogner, 2000). Its classic representative is Arum maculatum, which is often treated as the type (Hyperion, 2020). Species occur from western Europe to the Caucasus and Macaronesia, occupying woodlands, scrub, rocky slopes, and coastal maquis across lowlands to lower montane belts.

Morphologically, Arum is distinguished by erect or short rhizomatous herbs, frequently bearing a tuber, and entire to sagittate leaves without articulated abscission zones. The inflorescence is a unisexual spadix subtended by a spreading to hooded spathe, the spadix differentiated into a basal female zone, a male zone, and often sterile appendage above that may emit odors attractive to psychodid flies (Cahen et al., 2020). Flowers are reduced; the ovary is unilocular with basal to axile placentation, and fruits are berries that turn red at maturity, facilitating endozoochorous dispersal by birds or mammals (Hyperion, 2020).

Species richness is highest in the eastern Mediterranean and Near East, with numerous local endemics in Greece, Anatolia, and surrounding islands (Boyce, 2006). Typical habitats range from mesic woodland understories to dry limestone screes and maquis, with many taxa recorded from near sea level to c. 1500 m. Intrinsic biology is characterized by thermogenic spadices that volatilize amino acid-derived amines and phenols to attract pollinators (Cahen et al., 2020), and by early-season leaf emergence enabling ephemeral occupancy of favorable light conditions. Polyploidy is frequent; a base number x = 14 is well established, with tetraploid and hexaploid cytotypes reported for several species (Medhioub et al., 1983).

Taxonomically, Arum has been divided into sections on anatomical grounds (e.g., Gymnocaulocalyx based on stinging leaf hairs in some authors), and some historical treatments have merged Dracunculus or Arisaema within Arum, a view now rejected (Bentham & Hooker, 1883; Engler, 1920; APG IV, 2016). Current circumscription is stable in regional floras and major databases (Hyperion, 2020; WFO, 2024; POWO, 2024), with Arum retained as an independent genus separate from Dracunculus. Human relevance includes several ornamental and horticultural taxa, notably Arum italicum and A. maculatum, and the culinary use of A. palaestinum in Palestinian cuisine (Zohary, 1986). Some species are weedy in disturbed sites but not widely invasive.

Conservation concerns center on habitat loss and overharvesting for trade, with taxonomic uncertainties still impeding conservation assessments at the species level in some local endemics. Improved global phylogenetic resolution and consistent species delimitation will be key to future monitoring and effective management.

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