CHROMOSOME MORPHOLOGY OF THE NORTH AMERICAN SPECIES OF ACTAEA (RANUNCULACEAE). I

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Abstract
Karyotypes of three eastern North American taxa of Actaea we re investigated. Their karyotypes are as follows: A. rubra f. rubra K (2n) = 16 = 10V (2V + 8VCS) + 2J + 2] + 2h; A. rubra f. neglecta K (2n) = 16 = 10V (2V + SV08) + 2J + 2j + 2h; and A. pachypoda (A. alba) K (2n) =16 = 10V (6V + 4VCS) + 2J + 2jcs + 2h. Actaea rubra and its albino f. neglecta have identical karyotypes. The karyotypes of A. rubra f. rubra and A. pachypoda, 2 very distinct species, though similar, are clearly differentiated by the presence of a secondary constriction at the distal end of the long arm in the shorter of the 2 pairs of J-shaped chromosomes of A. pachypoda. The karyology of the 3 North American taxa is somewhat different from that reported by Kurita for A. asiatica.

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