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A morphometric study of Amaranthus cruentus, A. retroflexus and their hybrid, A. &amp;times; turicensis based on 75 plant samples (750 inflorescences), collected throughout the Olomouc-Holice area (Czech &amp;nbsp; Republic), is presented. Using multivariete methods (including cluster analysis and canonical discriminant analysis), the existence of three groupings of plants was proven. The hybrid exhibited intermediate values of the width and length of female tepals, length of awl-shaped bracts, and seed size when compared with parental species. A germination experiment showed that dark seeds of A. &amp;times; turicensis as well as dark seeds of A. retroflexus germinate scarcely and independently on the day length while light seeds of A. cruentus germinate promptly and markedly better under a short day regime. The chromosome analysis showed that A. retroflexus, A. cruentus, and A. &amp;times; turicensis have the same chromosome number 34.

Morphometry analysis and seed germination of Amaranthus cruentus, A. retroflexus and their hybrid (A. × turicensis)