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CHROMOSOME NUMBERS AND GEOGRAPHIC DISTRIBUTION IN CHAENACTIS DOUGLASII (COMPOSITAE, HELENIEAE)

John S. Mooring
Madroño
Vol. 39, No. 4 (OCTOBER-DECEMBER 1992), pp. 263-270
Stable URL: http://www.jstor.org/stable/41424921
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
CHROMOSOME NUMBERS AND GEOGRAPHIC DISTRIBUTION IN CHAENACTIS DOUGLASII (COMPOSITAE, HELENIEAE)
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Abstract

A report of 2n= 15 II is new for Chaenactis douglasii (Hook.) Hook. & Arn., as are 12 II and 18 II for C. douglasii var. montana M. E. Jones. The frequency of meiotic aberrations (11%) was 33% of that found in a larger 1980 study. The correlation between ploidy level and age of substrate was highest in the Sierra Nevada and lowest in the Intermontane Plateaus.

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