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Genus Melinis 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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Melinis (P.Beauv.) belongs to the grass family (Poaceae), subfamily Panicoideae, subtribe Melinidinae, and comprises approximately 26–30 species in sub-Saharan Africa with introductions in the Americas and Australasia. The type is Melinis repens (Willd.) Zizka. Species such as M. minutiflora (molasses grass) and M. nerviglumis are widely cultivated and naturalized, while M. grandiflora remains a garden ornamental.

The genus is recognised by annual or perennial habits; culms often weak and decumbent; leaf blades linear to lanceolate with ciliate ligules and usually glabrous surfaces; and open to dense, ovoid to pyramidal panicles. Spikelets are solitary or in pairs, laterally compressed, long-pedicelled, with two unequal glumes, the lower typically small and the upper awnless and 3–5‑nerved. The lower florets are usually sterile with membranous lemmas, the upper florets bisexual with a hardened lemma that is either awned or awnless; caryopses are exposed at maturity. The ovary is superior with two styles, and the fruit is a caryopsis.

Diversity is concentrated in eastern and southern Africa, where many species are narrow endemics in grasslands, savannas, and forest margins up to c. 2500 m. Several taxa occupy disturbed sites and secondary grasslands. Biogeographically, Melinis shows clear African centres of richness with multiple dispersals into tropical America and Australia, where selected species have become naturalized.

Pollination is wind‑mediated and fruit dispersal is typically by spikelet movement; the persistent glumes and lemmas aid short‑distance transport. Plants are C4 and mainly perennial in savanna contexts. A base chromosome number of x = 9 has been reported in M. minutiflora and allies (e.g., Muhammad & Sırtı, 1984).

Phylogenetic studies consistently place Melinis within Melinidinae and sister to Urochloa (e.g., Linder et al., 2010; Bouchenak‑Khelladi et al., 2014). Traditional treatments recognized Rhynchelytrum for the “red Natal grass” group; however, current consensus based on morphology and multi‑gene analyses treats Rhynchelytrum as nested within Melinis, and the latter now circumscribed broadly (Linder et al., 2010; GBIF, 2024). Alternative narrower concepts persist in some regional treatments, but the broader Melinis is widely adopted (WFO, 2024).

Several species are horticulturally significant: M. grandiflora and M. repens are cultivated ornamentals, while M. minutiflora is used for forage and soil stabilization. M. minutiflora has become invasive in the Americas and Pacific islands, altering fire regimes. Conservation concerns focus on habitat fragmentation in biodiversity‑rich regions and accurate delimitation of narrow endemics.

Future work should resolve species limits in the M. repens complex and refine biogeographic histories via expanded sampling across eastern and southern Africa (Linder et al., 2010).

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