Skip to main content

Phylogeography of the Narrow Endemic, Helenium virginicum (Asteraceae), Based upon ITS Sequence Comparisons

Buy Article:

$15.00 plus tax (Refund Policy)

The federally listed threatened species, Helenium virginicum, is endemic to 30 sinkhole ponds in two counties in Virginia, but a Helenium population in Pomona, Missouri, differs scarcely from H. virginicum from Virginia in morphology, ecology, and non-coding nrDNA ITS sequences. In response to continuing taxonomic uncertainty regarding the Missouri population, we enlarged our ITS comparisons from our previous work to include 48 populations, more than doubling the number of H. virginicum populations, and including populations of H. autumnale and H. flexuosum from 12 states in the United States and two Canadian provinces. Phylogenetic analyses were conducted using Bayesian, maximum-likelihood, and maximum-parsimony methods, and showed strong support for a monophyletic species of all H. virginicum from Virginia, the Pomona population and 29 other recently discovered populations in Missouri. We conclude that H. virginicum is narrowly endemic and disjunct between Virginia and Missouri. Additionally, one population of H. autumnale from the Bruce Peninsula, Canada, was found to be the sister group to H. virginicum. We discuss the impact of Pleistocene and Holocene geoclimatic changes on the phylogeography of these plants, including the possibility that the H. autumnale complex has become more disjunct and narrowly endemic since the Xerothermic Period (8–4Ka).
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Regular Paper

Publication date: 2005-10-01

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more