Abstract Detail

Systematics Section/ASPT

Archibald, Jenny K [1], Kephart, Susan R [2], Theiss, Kathryn E [2], Petrosky, Anna L [3], Culley, Theresa [4].

Multi-locus phylogenetic inference in subfamily Chlorogaloideae and related genera of Agavaceae, informing questions in taxonomy at multiple ranks.

Although the circumscription of many plant groups has been robustly inferred since their inception, lilies clearly do not fit that pattern. One family allied with this complex group is Agavaceae (or Agavoideae, Asparagaceae), often prominent in xerophytic habitats. A series of taxonomic questions at multiple levels have remained within its less well-known subfamily Chlorogaloideae s.s. (comprising Camassia, Chlorogalum, Hastingsia, and Schoenolirion), typical of mesic to wetland communities. We present the first phylogenetic hypotheses focused on Chlorogaloideae that are based on multiple independent loci and that include a wide sampling of outgroups across Agavaceae. In addition to chloroplast regions ndhF and trnL-trnF, we used nrDNA ITS for phylogenetic inference. Incomplete concerted evolution of the latter was indicated by intra-individual site polymorphisms for many individuals. Comparisons of four coding and analysis methods for these characters indicate that the region remains phylogenetically informative. Our results confirm that Chlorogaloideae s.s. is not monophyletic, due to the close relationship of Schoenolirion with Hesperaloe and Hesperoyucca, as well as the likely sister relationship between Hesperocallis and core Chlorogaloideae (Camassia, Chlorogalum, and Hastingsia). Chlorogalum is also strongly supported as not monophyletic, being divided into vespertine and diurnal clades. This study produced the first phylogenetic hypotheses across Hesperaloe, allowing initial tests of several taxonomic disagreements within this genus. Results revealed the lack of cohesion of H. funifera, with H. funifera ssp. funifera being more closely related to H. campanulata than H. funifera ssp. chiangii (= H. chiangii). With potential for hybridization between many members of Hesperaloe, as well as a possible hybrid origin for H. campanulata, the genetic relationships within this genus appear complex.

1 - University Of Kansas, RL McGregor Herbarium & Bridwell Botanical Research Lab, 2045 Constant Ave, Lawrence, KS, 66047-3729, USA
2 - WILLAMETTE UNIVERSITY, Department Of Biology, SALEM, OR, 97301, USA
3 - University of California, Berkeley, Department of Integrative Biology, Berkeley, CA, 94720, USA
4 - University Of Cincinnati, Department Of Biological Sciences, 614 Rieveschl Hall, Cincinnati, OH, 45221-0006, USA

Keywords:
Agavaceae
Chlorogaloideae
Chlorogalum
Hesperaloe
Hesperocallis
ITS.

Presentation Type: Oral Paper:Papers for Sections
Session: 31
Location: Pines South/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 2:00 PM
Number: 31003
Abstract ID:574
Candidate for Awards:None