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.

Cytotaxonomic Studies in the Gramineae Spartina, Andropogon and Panicum

George L. Church
American Journal of Botany
Vol. 27, No. 4 (Apr., 1940), pp. 263-271
Stable URL: http://www.jstor.org/stable/2436892
Page Count: 9
  • Read Online (Free)
  • Download ($12.00)
  • 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.
Cytotaxonomic Studies in the Gramineae Spartina, Andropogon and Panicum
Preview not available

Abstract

The somatic chromosome complement is reported for the following members of the Gramineae: 9 species and 4 varieties of Spartina, 9 species and 8 varieties of Andropogon, and 3 varieties of Panicum. Intraspecific polyploidy is described in 3 species of Spartina. S. patens is tetraploid, the northern variety juncea is hexaploid and the southern variety juncea is octoploid. S. alterniflora of the strand is octoploid and the taller variety of tidal lagoons is decaploid. S. pectinata of the Atlantic coast is hexaploid and material from western United States is dodecaploid. The varieties studied of Andropogon virginicus of the Atlantic coastal plain, including A. glomeratus, are diploid. Similarly the varieties of A. scoparius, including A. littoralis, are tetraploid. Recent taxonomic treatments of these "species complexes" are in harmony with the cytological data. Tetraploid and hexaploid morphologically distinct forms of A. provincialis are reported. A large, ascending, decaploid form of A. saccharoides is described. An Atlantic coast tetraploid variety of Panicum virgatum is contrasted with western tetraploid and octoploid forms. Cytological data and citation of herbarium specimens concerned in the study are presented in a table.

Page Thumbnails

  • Thumbnail: Page 
263
    263
  • Thumbnail: Page 
264
    264
  • Thumbnail: Page 
265
    265
  • Thumbnail: Page 
266
    266
  • Thumbnail: Page 
267
    267
  • Thumbnail: Page 
268
    268
  • Thumbnail: Page 
269
    269
  • Thumbnail: Page 
270
    270
  • Thumbnail: Page 
271
    271