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 need an accessible version of this item please contact JSTOR User Support

A Molecular Assessment of Relationships among Cryptic Species of Botrychium Subgenus Botrychium (Ophioglossaceae)

Warren D. Hauk
American Fern Journal
Vol. 85, No. 4, Use of Molecular Data in Evolutionary Studies of Pteridophytes (Oct. - Dec., 1995), pp. 375-394
Published by: American Fern Society
DOI: 10.2307/1547816
Stable URL: http://www.jstor.org/stable/1547816
Page Count: 20
  • Get Access
  • Read Online (Free)
  • Download ($8.00)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
A Molecular Assessment of Relationships among Cryptic Species of Botrychium Subgenus Botrychium (Ophioglossaceae)
Preview not available

Abstract

Phylogenetic relationships among 20 currently recognized species of Botrychium subgenus Botrychium were investigated using nucleotide sequences from the plastid gene rbcL. Analysis of eight diploid species produced a single most parsimonious tree with three distinct clades. The lanceolatum clade (one species) was sister to all other species. The lunaria clade (two species) was sister to the simplex-campestre clade (five species) which contained two weakly supported subclades. Single populations of B. lunaria and B. simplex were more closely related to other species in the same geographic region than to populations of their own species from distant geographic regions. In a second analysis that included both diploid and polyploid species, eight of twelve polyploid taxa had rbcL sequences identical to those of known diploids, which suggested relatively recent origins for these eight polyploid species. Four polyploids, B. ascendens, B. paradoxum, B. ×watertonense, and B. minganense, did not associate with a diploid species, and therefore represented polyploid derivatives of diploid taxa that were not sampled and possibly are extinct. Associations of diploid and polyploid species as determined by rbcL analysis are consistent with morphological hypotheses of polyploid origins with the exception of B. ascendens, which did not possess the rbcL sequence of either of its putative diploid progenitors.

Page Thumbnails

  • Thumbnail: Page 
[375]
    [375]
  • Thumbnail: Page 
376
    376
  • Thumbnail: Page 
377
    377
  • Thumbnail: Page 
378
    378
  • Thumbnail: Page 
379
    379
  • Thumbnail: Page 
380
    380
  • Thumbnail: Page 
381
    381
  • Thumbnail: Page 
382
    382
  • Thumbnail: Page 
383
    383
  • Thumbnail: Page 
384
    384
  • Thumbnail: Page 
385
    385
  • Thumbnail: Page 
386
    386
  • Thumbnail: Page 
387
    387
  • Thumbnail: Page 
388
    388
  • Thumbnail: Page 
389
    389
  • Thumbnail: Page 
390
    390
  • Thumbnail: Page 
391
    391
  • Thumbnail: Page 
392
    392
  • Thumbnail: Page 
393
    393
  • Thumbnail: Page 
394
    394