A Fertile Interspecific Hybrid in Trifolium (4n T. repens L. x 4n T. nigrescens Viv.)

Abstract
Two fertile hybrid plants were obtained from reciprocal crosses of colchicine-doubled plants of T. repens (2n=64) and T. nigrescens (2n=32). F1 and l1 progeny of these hybrids had 2n=48. Cytogenetic evidence concerning the hybrids suggests that T. nigrescens may be one of the ancestors of amphiploid T. repens.

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