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United States Department of Agriculture

Agricultural Research Service


item Spooner, David
item Dejong D C
item Byung-yun Sun
item Stuessy Tod F
item Gengler Karla M
item Nesom Guy L
item Berry Paul E

Submitted to: Botanical Garden Annals Missouri
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/22/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary: Chromosomes are structures within the cell that contain the genetic information that regulate all of the processes of life. Different plants contain different numbers of chromosomes within each cell. A knowledge of the number of chromosomes is useful for many things, including prediction of breeding success and knowledge of genetic relationships. This paper reports new knowledge of chromosome counts for 41 collections of wild sunflower relatives. Many of these chromosome counts are reported here for the first time.

Technical Abstract: Forty-two chromosome counts of Compositae are reported from Ecuador and Venezuela. A first generic count is reported for Stuckertiella Beauverd (n=11-12), and first counts also are reported for17 species in Ageratina Spach, Chromolaena DC., Coespeletia Cuatrec., Erigeron L., Espeletia Mutis, Gynoxys Cass., Hinterhubera Sch. Bip., Oritrophium (Kunth) Cuatrec., Pentacalia Cass., Ruilopezia Cuatrec., Senecio L., Tanacetum L., and Vasquezia Phil. Additional counts also are provided for 23 populations of previously counted taxa, two of which are new numbers. The taxonomic implications of certain of these counts are discussed.

Last Modified: 10/16/2017
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