Familia: Poaceae Gramineae Juss. (Grass family, Süßgräser)
Subfamilia: Pooideae
Tribus: Triticeae
Genus: Hordeum L. - (barley, l'orge, l'orzo, cebada, Gerste)
syn.: Critesion Raf., Critho Meyer, Zeocrithon P.Beauv., Zeocriton Wolf
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Species: ~32
Geography: temperate northern hemisphere, temperate South America, temperate South Africa.
- Hordeum arizonicum Covas
- Hordeum bogdanii Wilensky
- Hordeum brachyantherum Nevski
- Hordeum brevisubulatum (Trin.) Link
- Hordeum bulbosum L. - (l'orge noueuse)
- Hordeum capense Thunb.
- Hordeum chilense Roem. & Schult.
- Hordeum comosum J.Presl
- Hordeum cordobense Bothmer et al.
- Hordeum depressum (Scribn. & J.G.Sm.) Rydb. - (low barley, dwarf barley).
- Hordeum erectifolium Bothmer et al.
- Hordeum euclaston Steud.
- Hordeum flexuosum Nees ex Steud.
- Hordeum fuegianum Bothmer et al.
- Hordeum guatemalense Bothmer et al.
- Hordeum gussoneanum - (sea barley, Trockenborstige Strandgerste).
- Hordeum intercedens Nevski
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Hordeum jubatum L. - (foxtail barley, l'orge à crinière, Mähnengerste) - North and South America, Sibiria, Central Europe.
- Hordeum lechleri (Steud.) Schenck
- Hordeum marinum Huds. - (sea barley, l'orge maritime)
- Hordeum murinum L. - (wall barley, l'orge des rats, Mäusegerste)
- Hordeum muticum J.Presl
- Hordeum parodii Covas
- Hordeum patagonicum (Hauman) Covas
- Hordeum procerum Nevski
- Hordeum pubiflorum Hook.f.
- Hordeum pusillum Nutt. - (little barley)
- Hordeum roshevitzii Bowden
- Hordeum secalinum Schreb. - (l'orge faux seigle, Roggengerste)
- Hordeum stenostachys Godr.
- Hordeum tetraploidum Covas
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Hordeum vulgare L. - (barley, l'orge commune, Kulturgerste)
- Hordeum vulgare subs. vulgare L. - (barley, l'escourgeon, Kulturgerste)
- Hordeum vulgare subsp. spontaneum L. - (wild barley, Wildgerste)
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