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Mediterranean. Barley or Knee. Barley (Hordeum marinum subsp. gussoneanum [syn. Critesion marinum subsp. gussoneanum]), an annual grass originally native to the Mediterranean area but now widely naturalised in the temperate zones. It is not cultivated, has a reputation as a vector for rust fungus and is usually seen a weed around the edge of pastures or on rough ground. hordeum-2292htm'>Hordeum. .