Six hybrid genera of the tribe TRITICEAE are recognized from North America:[Formula: see text]Binomials and parentages are given for different combinations of species of the parental genera.Nomenclatural proposals include × Agrositanion Bowden; × Elysitanion Bowden; × Sitordeum Bowden; × Agroelymus dorei Bowden; × Agrohordeum macounii (Vasey) Lepage nm. valencianum Bowden; × Elyhordeum dutillyanum (Lepage) Bowden nm. dutillyanum and nm. littorale (Hodgson & Mitchell) Bowden; × Elyhordeum schaackianum (Bowden) Bowden; × Elyhordeum piperi (Bowden) Bowden; × Elyhordeum dakotense (Bowden) Bowden; × Elyhordeum triploideum (Bowden) Bowden; × Elyhordeum stebbinsianum (Bowden) Bowden; × Elyhordeum berkeleyanum (Bowden) Bowden; × Elyhordeum montanense, (Scribn. in Beal) Bowden; × Agrositanion saundersii (Vasey) Bowden; × Agrositanion saxicola (Scribn. & Smith) Bowden; × Elysitanion hansenii (Scribn.) Bowden; × Elysitanion aristatum (Merr.) Bowden; and × Sitordeum californicum Bowden.
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Wray M. Bowden (1967) studied this question.
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