TAXONOMY OF INTERGENERIC HYBRIDS OF THE TRIBE TRITICEAE FROM NORTH AMERICA

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Abstract
Six hybrid genera of the tribe Triticeae are recognized from North America: X Agroelymus Camus (Agropyron X Elymus); X Agrohordeum Camus (Agropyron X Hordeum); X Elyhordeum Mansf. (Elymus X Hordeum); X Agrositanion Bowden (Agropyron X Sitanion); X Elysitanion Bowden (Elymus X Sitanion); and X Sitordeum Bowden (Sitanion X Hordeum). Binomials and parentages are given for different combinations of species of the parental genera. Nomenclatural proposals include X AGROSITANION Bowden; X ELYSITANION Bowden; X SITORDEUM Bowden; X groelymus dorei Bowden; X Agronordeum macounii (Vasey) Lepage nm. valencianun Bowden; X Elyhordeum dutillyanum (Lepage) Bowden nm. dutillyanum and nm. littorale (Hodgson et Mitchell) Bowden; X Elyhordeum schaackianum (Bowden) Bowden; X Elyhordeum piperi (Bowden) Bowden; X Elyhordeum dakotense (Bowden) Bowden; X elyhordeum triploideum (Bowden) Bowden; X Elyhordeum stebbinsianum (Bowden) Bowden; X Elynordeum berkeleyanum (Bowden) Bowden; X Elyhordeum montenense (Scribn. in Beal) Bowden; X Agrositanion saundersii (Vasey) Bowden; X Agrositanion saxicola (Scribn. et Smith) Bowden; X Elysitanion hansenii (Scribn.) Bowden; X Elysitanion aristatum (Merr.) Bowden; and X Sitordeum californicum Bowden.