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Die Systematik der Avena sterilis und A. fatua (Gramineae). Eine kritische Studie

Hildemar Scholz
Willdenowia
Bd. 20, H. 1/2 (Feb. 28, 1991), pp. 103-112
Stable URL: http://www.jstor.org/stable/3996727
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Die Systematik der Avena sterilis und A. fatua (Gramineae). Eine kritische Studie
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Abstract

The hexaploid morphospecies Avena sterilis and A. fatua, the wild and the weed oats, and the cultivated crop A. sativa, are commonly regarded as the principal components of a tripartite classification system. It is superior to the two alternatives: (1) to follow a closer biospecies concept in recognizing only a single species, A. sativa, or (2) to subdivide, according to the proposals of Baum (1977), both A. sterilis and A. fatua in three "semispecies", primarily on the basis of micromorphological characters. Consequently, the well-known Avena system of Malcev (1930) is modified here and up-to-dated, omitting the cultivars from any taxonomic consideration; the following subspecies are recognized: A. sterilis subsp. sterilis, A. sterilis subsp. atherantha, A. sterilis subsp. ludoviciana, A. fatua subsp. fatua, A. fatua subsp. septentrionalis, A. fatua subsp. meridionalis, A. fatua subsp. aemulans; the combinations A. sterilis subsp. atherantha and A. fatua subsp. aemulans are new to science. Important macromorphological criteria, useful for scientific and practical purposes, are i.a. the abscission scar configuration of the lemmas. The A. sativa fatuoids and steriloids cannot be distinguished clearly from the A. fatua taxa; therefore, they are united together with A. fatua in a single taxonomic group under this name. This procedure is in agreement with the widely accepted hypothesis of the origin of A. fatua in historical times from the cultivated A. sativa, the latter being derived from A. sterilis (monophyletic hypothesis vs diphyletic hypothesis with A. sterilis and A. fatua as ancestors). A comprehensive identification key for all subspecies is also included.

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