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Chromosome Numbers of Vernonieae (Compositae)
Samuel B. Jones, Jr.
Bulletin of the Torrey Botanical Club
Vol. 106, No. 2 (Apr. - Jun., 1979), pp. 79-84
Published by: Torrey Botanical Society
Stable URL: http://www.jstor.org/stable/2484281
Page Count: 6
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Chromosome numbers are reported for 57 species of Vernonieae from North and South America and from Africa. The genera included are Bothriocline, Centratherum, Elephantopus, Erlangea, Ethulia, Gutenbergia, Muschleria, Triplotaxis, and Vernonia. With these additions, chromosome numbers are now known from 16 of the 70 genera of Vernonieae. On a worldwide basis, genera with x = 10 predominate with the second greatest number having x = 9. The Old World Vernonias are dibasic with x = 9, or 10, and have polyploids derived from either base number. Vernonia in the New World has a base number of x = 17 which is assumed to represent ancient polyploids derived by aneuploidy from a base of x = 9. Cytologically, this tribe has less known about it than any of the other tribes of the Compositae tribes and much remains to be done.
Bulletin of the Torrey Botanical Club © 1979 Torrey Botanical Society