Abstract
Buds of Claytonia virginica were examined from 9 locations in the metropolitan New York area. A large amount of meiotic irregularity was characteristic of the populations studied. Chromosome counts on pollen mother cells were higher than any reported previously for the taxon, which contains an extensive aneuploid series including at least 40 different numbers ranging from 2n = 12 to ca. 190. In one New Jersey population, plants having approximately 90 chromosomes were associated with those having only 16. All the observations indicated that Claytonia virginica is an unusual species with an ability to tolerate fluctuations in chromosome material without apparent effects on fertility and morphology.
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