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Genus Arundo in Family Poaceae

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 grass genus Arundo L. belongs to the family Poaceae, tribe Arundineae, and is placed in the subfamily Arundinoideae (Soreng et al., 2015). It includes about three species and is native to the Mediterranean basin and East Asia, now widely naturalised in temperate and subtropical regions. The type species is Arundo donax L. (POWO, 2024; WFO, 2024).

Morphologically, Arundo consists of robust, rhizomatous perennials with erect culms reaching 3–6 m. Leaves are long, lanceolate, with conspicuous sheaths and a membranous ligule; they are glabrous or sparsely hairy. The inflorescence is a large, plume‑like panicle bearing spikelets 1–3 cm long, each with 2–8 florets; lemmas may be awned or unawned. The fruit is a solitary caryopsis with a superior ovary.

Species richness is concentrated in the Mediterranean A. plinii and the Sino‑Himalayan A. donax and A. micrantha (Veldkamp, 1981). A. plinii is restricted to coastal marshes and sand dunes of Iberia and northwestern Africa, whereas A. donax occupies riverbanks and disturbed sites from sea level up to 1 500 m in Asian mountains. The genus shows strong endemism at these regional centers.

As in most grasses, pollination is wind‑mediated; the lax panicles shed abundant pollen that reaches receptive stigmas of neighboring individuals. Seed dispersal relies on wind and water transport of the light caryopses, while vigorous rhizome fragmentation enables rapid clonal spread (Watson & Dallwitz, 1992). No specialized pollinators or dispersal agents beyond these mechanisms have been reported.

Originally treated as a monotypic genus, Arundo was revised to include three species by Veldkamp (1981), a view upheld by POWO (2024) and WFO (2024). Molecular phylogenies place Arundo in the Arundineae, sister to Phragmites (Soreng et al., 2015). Some authors have proposed merging the two genera, but this treatment remains controversial and is not widely accepted.

Arundo donax is cultivated for erosion control, biofuel production, and as a source of reeds for musical instruments; its aggressive growth makes it a serious invasive weed in many temperate regions. A. plinii serves as an ornamental pond plant, and the genus contributes to riparian restoration projects. No species are harvested for timber or food.

While A. donax continues to expand its range, A. plinii faces habitat loss in Mediterranean coastal zones, prompting conservation attention. Future work should clarify species boundaries and develop integrated control strategies for invasive populations.

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