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Genus Urochloa 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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Urochloa (family Poaceae) is a tropical–subtropical grass genus of approximately 100–150 species, found across Africa, the Americas, tropical Asia, and Australia in savannas, grasslands, roadsides, and disturbed sites; the type species is commonly treated as Urochloa panicoides P.Beauv. The genus is distinguished by its racemose inflorescences bearing solitary or paired spikelets on short, usually hairy pedicels, with the lower glume typically reduced or absent and the upper lemma often mucronate; the caryopsis is elliptical to obovoid with a punctiform to short-linear hilum. Species are usually perennial or annual caespitose or rhizomatous herbs with flat leaf blades, often glabrous or sparsely hairy nodes and culms, and spikelets that are dorsally compressed relative to the rachis. Centers of diversity occur in Africa and tropical Asia, with several species endemic to regional savannas and woodlands; many taxa are widespread weeds of warm cultivation. The base chromosome number is x=7 with frequent polyploidy (Borrill, 1997).

Historically aligned with Brachiaria, recent treatments based on molecular phylogenetics and morphology recircumscribe Urochloa to include most American and Asian taxa formerly placed in Brachiaria, while retaining Brachiaria s.str. for a small group of African species; some austral species (e.g., U. mollis) are now placed in Megathyrsus (Choi & Johnson, 2016; Salariato & Morrone, 2019). Horticulturally, U. brizantha, U. decumbens, U. humidicola, and U. ruziziensis are important pasture and forage grasses, and the genus also supplies ornamentals and a small number of local weeds and occasional invaders (Wikipedia, 2025; POWO, 2024). Conservation actions are localized for endemic taxa and could benefit from improved delimitation and demographic assessments in under-surveyed regions, especially given ongoing taxonomic refinements (WFO, 2024; Kimberley & Renvoize, 2022).

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