The natural heptaploid of Leucanthemum (2n = l7x) = 63) has been found for the first time in Yugoslavia (on the mountain of Treskavica, at Vratlo, 1700 m above sea level). This is a hybrid derived from the octo- ploid L. montanum var. heterophyllum (2n = (8x) = 72) and the hexaploid L. chloroticum (2n = (6x) = 54). Since the population includes aneuploids with 2 to 10 B chromosomes or without them, the chromosome numbers vary considerably, both from plant to plant and from cell to cell.
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