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Genus Dinebra 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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Dinebra Jacq. is a genus of C₄ grasses in the subfamily Chloridoideae, tribe Zoysieae of Poaceae. About twelve species are currently accepted (POWO, 2024; WFO, 2024). It occurs in tropical and subtropical regions of Africa, Asia, and Australia, mainly in open grasslands, savannas, and disturbed sites. The type species is Dinebra retroflexa (Poir.) B.K.Simon, a widespread weed‑like grass (Kellogg, 2015).

Morphologically Dinebra are tufted grasses with culms prostrate to erect. Leaves are linear, flat or inrolled, with a membranous ligule. Inflorescences are panicles; spikelets are laterally compressed with multiple florets. Lemmas keeled and awnless, glumes ovate. The fruit is a small, laterally compressed caryopsis with a short awn aiding wind‑assisted dispersal (Clayton & Renvoize, 1982; Kellogg, 2015).

Species richness is highest in East and Southern Africa, where several endemics occur on floodplains and outcrops. Dinebra australasica is confined to northern Australia, while Dinebra gracilis occurs in the Indian subcontinent. Most taxa occupy open habitats from sea level to ~2 000 m, preferring well‑drained soils. The genus shows a classic Old World tropical distribution, with few introductions elsewhere (WFO, 2024; Linder et al., 2021).

Like other chloridoid grasses, Dinebra is wind‑pollinated, producing lightweight pollen. Seeds mature in spikelets and are shed when the panicle breaks; the awn on the caryopsis acts as a parachute for wind‑driven dispersal. Chromosome numbers are 2n = 18 (x = 9), reported for several species and consistent with Zoysieae (Gregory, 1976). The genus employs the C₄ photosynthetic pathway, enhancing water‑use efficiency in arid habitats.

Molecular phylogenies place Dinebra in Chloridoideae, tribe Zoysieae, as sister to Zoysia (Peterson et al., 2010; Linder et al., 2021). No subgeneric ranks are recognized; species form a single lineage. Historically, the genus was merged with Leptochloa, but current taxonomy retains Dinebra as distinct (POWO, 2024; WFO, 2024). The type species remains Dinebra retroflexa, anchoring the generic concept.

Several Dinebra species, especially Dinebra arabica, are used as low‑maintenance forage in arid pastures. In contrast, Dinebra retroflexa is a widespread weed in maize, sorghum, and sugarcane fields, where its rapid growth hampers crop establishment. The genus provides no timber, and ornamental use is minimal; its main relevance is in pasture improvement or weed control (WFO, 2024).

Although most species remain widespread and of least concern, localized endemics face pressure from habitat conversion and overgrazing; targeted surveys are needed to clarify their conservation status. Continued integration of molecular and morphological data will likely refine species limits and inform management decisions (POWO, 2024).

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