Abstract Detail

Systematics Section/ASPT

Stoughton, Thomas [1], Jolles, Diana [1], O'Quinn, Robin [2].

Developing a species complex: systematics and biogeography of Claytonia lanceolata sensu lato (Montiaceae).

Polyploidy is well documented in Claytonia (Montiaceae), a predominantly montane genus in temperate North America. 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 Claytonia species. Recent efforts to revise hypotheses of phylogenetic relationships among tuberous perennial Claytonia species, including the western C. lanceolata complex, have catalyzed further exploration into patterns of hybridization, ecological niche differentiation, and speciation. At least ten varieties have been described for C. lanceolata s.l., but few are recognized in current taxonomic treatments. A 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 is paraphyletic. We use this new information to evaluate the evolutionary significance of morphological and cytological characteristics that have been traditionally used to circumscribe taxa in Claytonia. Our findings support the long-standing hypothesis that hybridization and polyploidy are strong evolutionary forces at work in this group of mostly succulent annuals and perennials.

Broader Impacts:

1 - Rancho Santa Ana Botanic Garden, Claremont Graduate University, 1500 North College Avenue, Claremont, CA, 91711, USA
2 - Eastern Washington University, Biology 234-C Science Building, Cheney, WA, 99004-2440, USA

Keywords:
biogeography
Claytonia
hybridization
Polyploidy.

Presentation Type: Oral Paper:Papers for Sections
Session: 4
Location: Magnolia/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 9:00 AM
Number: 4003
Abstract ID:815
Candidate for Awards:None