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Elymus caput-medusae L. Crosses with Aegilops cylinderia Host¹

A fertile allohexaploid was obtained from a cross between E. caput-medusae (2n=14) and Ae. cylindrica (2n=28). The F₁ intergeneric hybrid was larger than either parent in most morphological characteristics, but lacked the 3- or 4-inch awns of E. caput-medusae. The F₁ and amphiploid more closely resembled the Aegilops parent than Elymus. The embryo culture technique was used in obtaining the F1 hybrid.

The F₁ hybrid had a chromosome complement of 2n=21 and was sterile. Chromosome behavior was irregular and variable in the microsporocytes examined of the F₁ hybrids. Chromosome doubling was induced in the F₁ hybrid by colchicine treatment producing the fertile amphiploid intergeneric hybrid (2n=42).

² Associate Professor, North Dakota State University, Fargo.

Received for publication July 26, 1965.