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.

Generic Boundaries in the Senecioneae

T. M. Barkley
Taxon
Vol. 34, No. 1 (Feb., 1985), pp. 17-21
DOI: 10.2307/1221558
Stable URL: http://www.jstor.org/stable/1221558
Page Count: 5
  • Read Online (Free)
  • Download ($14.00)
  • 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.
Generic Boundaries in the Senecioneae
Preview not available

Abstract

Since the time of Bentham the traditional view of the Senecioneae has been that of one huge genus (Senecio) plus numerous segregate genera of varying degrees of distinctiveness, plus a few entities of uncertain affinities. Data have accumulated to support the exclusion of some genera from the tribe (e.g. Arnica, Liabum, Munnozia, Schistocarpha, etc.) and to tease botanists about the circumscriptions and affinities of others. Senecio sensu lato incorporates several semi-distinctive natural assemblages that usually have been treated as sections or subgenera. The naturalness of these assemblages is generally acknowledged, as is the fact that the boundaries separating them are imprecise by whatever suites of characters are used to measure them. In several recent studies many segregate genera have been recognized, often with the circumscriptions derived from selected representative species. It is yet unclear that the recognition of numerous segregate genera provides a better taxonomy than treating the variation patterns as infrageneric taxa. A respectable case can be made for maintaining Senecio as a broad concept, at least until revisionary studies at the species level are carried out and the results subjected to critical analyses.

Page Thumbnails

  • Thumbnail: Page 
17
    17
  • Thumbnail: Page 
18
    18
  • Thumbnail: Page 
19
    19
  • Thumbnail: Page 
20
    20
  • Thumbnail: Page 
21
    21