DISTRIBUTION AND CYTOLOGY OF ELYMUS MACOUNII VASEY

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Abstract
The distribution of Elymus macounii Vasey in the Prairie Provinces of Canada is extensive and apparently governed by the occurrence of its putative parents, Agropyron trachycaulum (Link) Malte and Hordeum jubatum L. The hybrid E. macounii was produced by controlled cross-fertilization of A. trachycaulum and H. jubatum. Subsequently, octoploid E. macounii was obtained by colchicine treatment. Cytological studies indicated 2n = 28 for A. trachycaulum, H. jubatum, and E. macounii (both artificially produced and naturally occurring hybrids). Irregular meiosis of E. macounii and some irregularity in meiosis of octoploid E. macounii were observed.