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Abstract Detail



Polyploidy, microevolution and species level systematics

Dickinson, Tim [1], Talent, Nadia [1], Coughlan, Jenn [2].

What is Crataegus gaylussacia A.Heller?

Crataegus gaylussacia A.Heller is the correct name for the taxon that comprises the black-fruited hawthorns of western North America that have 20 stamens per flower, rather than 10 as in C. douglasii and most other North American polyploid Crataegus. However, 20-stamen black-fruited hawthorns in North America include diploids, triploids, tetraploids, and rare pentaploids. The entities to which A. A. Heller applied the name C. gaylussacia appear to be a geographically, genetically, and morphologically distinct portion of this complex. We suggest that a solution to this problem is to restrict the application of Heller’s name, continue using the name C. suksdorfii (Sarg.) Kruschke for some entities, and name whatever entities remain that warrant recognition. Our approach to naming species in an agamic complex draws on molecular, cytological, biogeographic, and morphological data. The species that we propose to recognize thus may be predominantly outcrossing diploids, or they may be polyploid pseudogamous aposporous apomicts, variously of hybrid or other origin.

Broader Impacts:


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Related Links:
Related work on black-fruited hawthorns of North America


1 - Royal Ontario Museum, Natural History, 100 Queen\'s Park, Toronto, ON, M5S 2C6, Canada
2 - Duke University, Biology, 125 Science Drive, Durham, NC, 27708, USA

Keywords:
agamic complex
species concept
ITS2
cpDNA
biogeography
morphology
Polyploidy.

Presentation Type: Symposium or Colloquium Presentation
Session: C9
Location: Belle-Chasse/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 2:30 PM
Number: C9003
Abstract ID:447
Candidate for Awards:None


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