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Abstract Detail



Systematics Section/ASPT

Stoughton, Thomas [1].

Systematics and biogeography of Claytonia lanceolata sensu lato (Montiaceae): species complexes riddled with species complexes.

The origins and consequences of polyploidy in the enigmatic C. lanceolata s.l. remain poorly understood, as more focus has been on relatives in eastern North America and on annual species of Claytonia. Recent efforts to revise hypotheses of phylogenetic relationships among tuberous perennial Claytonia species, particularly the western C. lanceolata complex, have catalyzed further exploration into patterns of ecological niche differentiation and speciation in the genus. A lack of resolution in this clade of tuberous perennials (Claytonia section Claytonia) impedes better understanding of the biogeographic history and morphological evolution of lineages within it, preventing effective taxonomic revision. Currently few taxa are recognized in taxonomic treatments of Claytonia, yet molecular phylogenetic study of C. lanceolata and relatives, including the C. “peirsonii” complex of the North American desert southwest, indicates that cryptic species complexes are abound and that C. lanceolata as currently circumscribed is widely paraphyletic. This and other new information gathered from in the field is being used to evaluate the evolutionary significance of morphological characteristics that have been traditionally used to circumscribe taxa in Claytonia.


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1 - Claremont Graduate University, 1500 N. College Avenue, Claremont, CA, 91711, USA

Keywords:
Claytonia
Claytonia lanceolata
ecological divergence
genetic diversity
molecular systematics
phylogenetics
taxonomy
species delimitation.

Presentation Type: Oral Paper:Papers for Sections
Session: 14
Location: Cottonwoods North/Boise Centre
Date: Monday, July 28th, 2014
Time: 3:00 PM
Number: 14007
Abstract ID:536
Candidate for Awards:None


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