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Published in Crop Sci 9:774-778 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sources of Variation in Cynodon dactylon (L). Pers.1

Jack R. Harlan and J. M. J. de Wet2

The species Cynodon dactylon is enormously variable and has become truly cosmopolitan as a weed of disturbed habitats. Six botanical varieties are recognized in our classification, but only one is the widespread weed; the others are either narrow endemics or have restricted distributions. The great variability within the cosmopolitan variety appears to have been generated internally by genetic interaction of three of the six varieties and by fragmentation of the gene pool by translocation races.

Key Words: Bermudagrass • Classification • var. aridus • var. afghanicus • var. coursii • var. dactylon • var. elegans • var. polevansii • Cytology • Translocation races

1 Contribution from Agronomy Departments, University of Illinois and Oklahoma State University, supported in part by National Science Foundation Grants GB201 and GB2686.

2 Professors of Plant Genetics, Agronomy Department, University of Illinois, Urbana 61801.

Received for publication May 23, 1969.


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