Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

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
DOI: 10.2307/2484281
Stable URL: http://www.jstor.org/stable/2484281
Page Count: 6
  • Read Online (Free)
  • Download ($10.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Chromosome Numbers of Vernonieae (Compositae)
Preview not available

Abstract

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.

Page Thumbnails

  • Thumbnail: Page 
79
    79
  • Thumbnail: Page 
80
    80
  • Thumbnail: Page 
81
    81
  • Thumbnail: Page 
82
    82
  • Thumbnail: Page 
83
    83
  • Thumbnail: Page 
84
    84