ON THE NATURAL HYBRID POPULATION OF HEMEROCALLIS

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<jats:p> A large natural hybrid population between Hemerocallis middendorffii and Hemerocallis yezoensis occurs at Otanoshike and its neighborhood in the eastern part of Hokkaido, Japan. This report is the result of a comparative study on external morphology and cytological analysis of the hybrid swarm at Otanoshike and of the parental species from various localities in Hokkaido. The hybrid population at Otanoshike represents morphologically an "introgressive status", and this fact is well understood in connection with the ecological condition of the habitat. Among the hybrid swarm intermediate types are dominant. Cytologically, all the material examined was diploid, i.e., it had 2n = 22. </jats:p>

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