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Genus Melica 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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Melica (Poaceae, Pooideae) is a temperate grass genus comprising about 85 species with broad distribution across Eurasia, Africa, North and South America, and the Himalayas to Malesia, often occurring on open slopes, rock crevices, grasslands, and forest margins from lowlands to high elevations; Melica nutans is the lectotype (GPWG II, 2012; Kellogg, 2015; Watson and Dallwitz, 1992). Perennial tufts, sometimes rhizomatous, characterize the habit; sheaths are typically closed, ligules are membranous, and blades are flat or rolled with acute or filiform tips; caryopses have linear hila, and nodes are glabrous or hairy. Infloresences are open or sometimes racemose panicles, the spikelets are few-flowered with usually 2–3 fertile florets, the upper florets are often reduced and contiguous within the glumes, disarticulation is above the glumes, and callus hairs are absent. Glumes are unequal to subequal, membranous to firm, with one to several nerves; lemmas are awnless or short-awned and typically have one or two prominent nerves; lodicules are truncate to lobed. Styles are short with laterally inserted stigmas, ovaries are superior, and ovules are pendulous on short funicles; fruits are caryopses with mealy endosperm. Centers of diversity include the Mediterranean and temperate Asia, with numerous endemics in mountainous regions, reflecting strong associations with temperate grasslands and open habitats. As a Pooideae member, Melica is wind-pollinated, and caryopses are primarily dispersed by gravity or short-distance mechanisms; although chromosome numbers are reported, base numbers remain variably inferred and are better treated as unresolved until comparative analysis is available. Recent phylogenies confirm Melica within subfamily Pooideae and tribe Poeae, while its placement among subtribes such as Glyceriinae versus Melicinae has been debated (GPWG II, 2012; Soreng et al., 2023; Saarela et al., 2015). Species boundaries are comparatively stable in temperate Eurasia and the Mediterranean but remain unsettled in parts of the Americas, where taxonomic revisions continue to clarify status and synonymy (POWO, 2024; WFO, 2024; GBIF, 2024). Some species, notably M. ciliata (syn. M. transsilvanica), are cultivated as ornamentals and occasional seed crops; occasional local expansions or naturalizations occur, but the genus is not globally invasive. Key threats include habitat loss from altered grazing and mowing regimes, with further research needed on phylogenetic resolution within subtribal frameworks and regional taxonomy to inform conservation and sustainable use.

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