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Genus Arundinella 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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Arundinella (Raddi) is a genus of perennial and occasionally annual grasses belonging to the family Poaceae, subfamily Panicoideae, where it has traditionally been placed in the tribe Arundinelleae, although some authors treat it within the Paniceae (Grass Phylogeny Working Group, 2015). The genus comprises roughly 70 accepted species (POWO, 2024; WFO, 2024) that range across tropical and subtropical regions of Africa, Asia, Oceania, and South America, occurring in savannas, open woodlands, forest margins, and wetter grasslands up to about 2 000 m elevation. The type species is Arundinella setosa (L.) Raddi, designated by the original author (Raddi 1823).

Morphologically Arundinella is distinguished by its caespitose habit, linear leaf blades that are usually flat with a prominent midrib, and leaf sheaths that may be closed and occasionally pubescent. Stipules are absent, as in most grasses. The inflorescences are panicles, often narrow, bearing solitary or paired spikelets that are pedicellate. Each spikelet typically contains one to two florets; the lower glume is present, sometimes awn‑like, and the upper glume is membranous. Lemmas are usually awnless, rarely bearing a short awn, and are oftenpubescent; the palea is well‑developed. The ovary is superior, unilocular with a single basal ovule, and the fruit is a free‑caryopsis typical of Poaceae (Flora of China 2006; Watson & Dallwitz 1992).

The centre of diversity lies in sub‑Saharan Africa and tropical Asia, with numerous endemics in Madagascar, the Indian subcontinent, and the Malesian archipelago (Clark et al., 2020). Species occupy a variety of habitats ranging from dry savanna to seasonally inundated grasslands, and some are confined to montane environments. Biogeographically, molecular analyses reveal distinct African and Asian clades, suggesting long‑term geographic isolation (Soreng et al., 2022).

Reproduction is wind‑mediated, a characteristic of most grasses. Seed dispersal is primarily anemochorous, though a few species possess hooked lemmas that may facilitate epizoochory. Chromosome numbers are generally based on x = 9, with many taxa exhibiting 2n = 36 (tetraploid) counts; for example, A. hirta has been recorded at 2n = 36 (Soreng et al., 2022).

Taxonomically Arundinella is recognised as monophyletic in recent phylogenies (Clark et al., 2020). No formal subgeneric ranks are widely accepted, though informal morphological groups have been proposed. Recent revisions have synonymised several local taxa (Sánchez et al., 2020), while alternative treatments by Clayton & Renvoize (1982) maintain the genus within Paniceae, reflecting the current taxonomic fluidity.

Humans employ several species for pasture and forage—A. setosa and A. nepalensis are valuable in tropical grazing systems and for soil stabilization. A few taxa have become weedy in cultivated fields, but the genus is not a major timber or ornamental source.

Conservation data remain sparse; many species are classified as Data Deficient, threatened primarily by habitat conversion and overgrazing (WFO, 2024). Targeted field surveys and integrative taxonomy are needed to assess extinction risk and guide future conservation strategies.

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