On some relationships between Avena sativa and A. fatua (Gramineae) as studied from Canadian material

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Abstract
Many authorities consider that Avena sativa and A. fatua constitute a single species. This attitude is based mainly on morphology, because of the existence of different intermediate forms, and partly on the belief that A. sativa is a product of selection by man from A. fatua. More recently, because of the absence of chromosomal differentiation cytogeneticists have tended to support this contention that A. sativa and A. fatua constitute a single species. This paper reports the discovery of two new characters based on the detailed micromorphology of the lodicules and epiblasts. These new characters per se as well as in combination with other macromorphologic characters proved to be most reliable for the discrimination and recognition of these two taxonomically specific units. Observations on Canadian material revealed spontaneous F1 hybrids or F1-like phenotypes. An attempt is made to correlate the available cytologic and genetic data with the present findings. A one-way and restricted gene flow from A. fatua to A. sativa is assumed to occur between these two coexisting species.

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