Abstract Detail

Systematics

Smith, James F [1], Stevens, McKayla [2], Sosa, Edgar [3], Mansfield, Donald H. [2], Darrach, Mark [4], Downie, Stephen R. [5], Plunkett, Gregory M. [6], Feist, Mary Ann [7].

Try, try again?: Resolving species boundaries within Lomatium triternatum (Apiaceae) and its close relatives.

Despite numerous definitions of species over the years, many plant species still rely on earlier morphological delimitations that often were based on single or few characters to define them. Modern molecular methods permit the testing of reciprocal monophyly of these species and redefine species boundaries in a more modern evolutionary context. Lomatium is one of 20 genera placed in the Perennial Endemic North America clade of Apiaceae and phylogenetic analyses have uncovered widespread paraphyly and polyphyly among the genera. Lack of monophyly is not restricted to the genera and with increased sampling of individuals, para- and polyphyletic species have been uncovered. This is true for the species complex of L. triternatum that has six published varieties and one form. Both L. triternatum var. platycarpum and L. triternatum var. anomalum have been elevated to species rank as L. simplex and L. anomalum, respectively. The phylogenetic placement of individuals of L. simplex confirms its monophyletic species status and L. triternatum var. brevifolium and L. triternatum var. macrocarpum are synonymous to each other and should be recognized as L. brevifolium. The remainder of the sampled varieties of L. triternatum form a complicated set of relationships with L. tamanitchii, L. packardiae, L. thompsonii, L. attenuatum, and L. grayi. The complication primarily reflects a misinterpretation of the morphologically based species boundaries of the sampled individuals. Re-examination of morphology and geographic distributions indicates that there are several undescribed species and that a combination of morphology, distribution, and phylogenetic analyses using DNA sequence data can clarify species boundaries in this group.

1 - BOISE STATE UNIVERSITY, Biology Department, 1910 UNIVERSITY DRIVE, MS1515, Boise, ID, 83725-1515, USA
2 - The College of Idaho, Department of Biology, 2112 Cleveland Boulevard, Caldwell, Idaho, 83605 , USA
3 - Boise State University, Department of Biological Sciences, 1910 University Drive, MS1515, Boise, Idaho, 83725, USA
4 - Corydalis Consulting, 3315 SW Marshall Ave., Pendleton, Oregon, 97801, USA
5 - University Of Illinois, Department Of Plant Biology, 265 MORRILL HALL, 505 S GOODWIN AVE, Urbana, IL, 61801, USA
6 - New York Botanical Garden, Cullman Program For Molecular Systematics, 2900 Southern Blvd., Bronx, NY, 10458-5126, USA
7 - University of Wisconsin-Madison, Department of Botany, B169 Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706-1361, USA

Keywords:
Apiaceae
Lomatium
phylogeny
species boundaries
paraphyly.

Presentation Type: Oral Paper
Session: 46, Asterids I part C & Asterids II
Location: 103/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 4:45 PM
Number: 46012
Abstract ID:229
Candidate for Awards:None