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Chromosome Numbers in Umbelliferae. III.

C. Ritchie Bell and Lincoln Constance
American Journal of Botany
Vol. 53, No. 5 (May - Jun., 1966), pp. 512-520
Stable URL: http://www.jstor.org/stable/2440351
Page Count: 9
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Chromosome Numbers in Umbelliferae. III.
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Abstract

Chromosome numbers are reported for 156 collections representing 100 taxa of Umbelliferae. Approximately two thirds of the collections are from Mexico, Central and South America and indicate a high percentage of polyploid species in certain genera found in this area. Chromosome numbers for plants belonging to 78 taxa are published here for the first time, previously published chromosome numbers are verified for 18 taxa and chromosome numbers differing from those previously published are reported in seven instances. No chromosome counts have been previously published for nine of the genera included here. Further aneuploidy and polyploidy were found in Eryngium, and Lomatium columbianum has been found to be a high polyploid with 2n = 14x. Every chromosome count is referable to a cited herbarium specimen.

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