Chromosome races in Rumex arcticus (Polygonaceae)

Rumex arcticus Trautv., a species found on the mainland of northwestern North America and in northeastern U.S.S.R., contains tetraploid (2n = 40), dodecaploid (2n = 120), and perhaps 2n = 160 and 2n = 200 chromosome races. Most North American plants are tetraploid and are larger in size and have mor...

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Bibliographic Details
Published in:Canadian Journal of Botany
Main Authors: Mulligan, Gerald A., Frankton, Clarence
Format: Article in Journal/Newspaper
Language:French
Published: Canadian Science Publishing 1972
Subjects:
Plant Science
Arctic
Bering Sea
Kamchatka Peninsula
Lawrence Island
Kamchatka
Seward Peninsula
St Lawrence Island
Alaska
Online Access:http://dx.doi.org/10.1139/b72-053
http://www.nrcresearchpress.com/doi/pdf/10.1139/b72-053
Description
Summary:Rumex arcticus Trautv., a species found on the mainland of northwestern North America and in northeastern U.S.S.R., contains tetraploid (2n = 40), dodecaploid (2n = 120), and perhaps 2n = 160 and 2n = 200 chromosome races. Most North American plants are tetraploid and are larger in size and have more compound and contiguous inflorescences than typical R. arcticus. Typical plants of R. arcticus occur in the arctic U.S.S.R., St. Lawrence Island in the Bering Sea, and at the tip of the Seward Peninsula of Alaska, and they all have 120 or more somatic chromosomes. High polyploid plants of R. arcticus that resemble North American tetraploids in appearance apparently occur on the Kamchatka Peninsula. These have been called R. kamtshadalus Komarov or R. arcticus var. kamtshadalus (Kom.) Rech. f. by some authors.

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