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A large collection of two polymorphic weeds, Portulaca oleracea Linn. and P. quadrifida Linn., originating from diverse sources, was cultivated under uniform conditions. This experiment revealed the extent and nature of be genetic variation in the two species. In the former there were found three qualitatively distinguishable variants all at hexaploid (n=27) level, while in the latter there were only two quantitatively distinct variants at 6x (n=27) and 12x levels. All these have been evaluated biosystematically.
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