CYTOTAXONOMY, PHYLOGENY, AND CANADIAN DISTRIBUTION OF CIRSIUM UNDULATUM AND CIRSIUM FLODMANII
- 1 January 1961
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Botany
- Vol. 39 (1) , 21-33
- https://doi.org/10.1139/b61-003
Abstract
The morphology and specific differences of Cirsium undulatum (Nutt.) Spreng. and of C. flodmanii (Rydb.) Arthur are described and their Canadian distributions are reported in detail. The chromosome numbers are C. undulatum f. undulatum and f. album Farwell, 2n = 26; C. flodmanii f. flodmanii and f. albiflorum D. Löve, 2n = 22. The origin of four North American species of Cirsium that do not follow the world-wide base number 17 is discussed; it is postulated that reduction in number has occurred by translocations. The chromosomes of species with reduced numbers are larger than those of the unreduced species but the total length of the chromosomes of both groups is approximately the same.Keywords
This publication has 2 references indexed in Scilit:
- The Karyotype Analysis and its Karyotaxonomic considerations in some Genera of Subtribe CarduinaeThe Japanese Journal of Genetics, 1957
- Natural Hybridization in the Genus Cirsium-I. C. discolor (Muhl. Ex Willd.) Spreng X C. Muticum MichxBulletin of the Torrey Botanical Club, 1951