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Chromosomes of Cruciferae I. Descurainia
J. T. Baldwin, Jr. and Jean Marshall Campbell
American Journal of Botany
Vol. 27, No. 10 (Dec., 1940), pp. 915-917
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2436560
Page Count: 3
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Chromosome numbers are reported, from leaf-smear determinations, for four species and ten subspecies of Descurainia. The genus has evolved on a 7-chromosome system: diploid, tetraploid, and hexaploid plants occur, polyploidy being often intraspecific. Detling (1939) observed phenotypic differences that are correlative with polyploid differences discovered during the present study and by those phenotypic differences, except in one instance, made nomenclatorial distinctions. In some species of Descurainia the polyploid groups occupy the most restricted geographic ranges and, in other species, the greatest ranges. In certain complexes the diploid subspecies tend to be northern in distribution and, in other cases, southern. Variations in size of characters within species of Descurainia are not regularly correlated with polyploid differences.
American Journal of Botany © 1940 Botanical Society of America, Inc.