CHROMOSOME NUMBERS IN THE COMPOSITAE. XIV. LACTUCEAE

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Abstract
Reports of 150 original chromosome counts are recorded, including reports of 22 genera and 57 species and subspecific taxa in tribe Lactuceae. Also included are first reports for 12 specific or subspecific taxa. x = 9 appears to be the ancestral base of the tribe. Chromosome numbers are known for over 85% of the genera of the tribe and the frequency of polyploidy is ca. 23%, which is about one‐half that of the angiosperms.
Funding Information
  • National Science Foundation (BMS75‐21300)

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