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Douglas, Norman [1], Wall, Wade [1], Xiang, Qiu-Yun (Jenny) [1], Hoffmann, William [1], Wentworth, Thomas [1], Gray, Janet [2], Hohmann, Matthew [3].

Relationship of the narrowly endemic Lilium pyrophilum (Liliaceae) to other pendent lilies in eastern North America.

The southeastern pendent lilies (Lilium , Liliaceae) have been recognized as a natural group that includes two widespread species, Lilium michauxii and Lilium superbum, and two narrow endemics, Lilium iridollae (endemic to pine savannahs in western Florida and adjacent Alabama) and Lilium pyrophilum, which was recently described from the Sandhills region of the Carolinas. Whereas the widespread Lilium michauxii has a conserved ecological niche, Lilium superbum is flexible and can be found from coastal marshes to mountaintops. The endemic species are of conservation concern. In this study we were primarily concerned with addressing hypotheses concerning the relationships of Lilium pyrophilum, which include peripheral isolation from L. superbum, hybrid origin between L. superbum and L. michauxii, and conspecificity with L. iridollae. We undertook to characterize relationships in this complex by employing sequence data from four chloroplast loci, the internal transcribed spacer (ITS) and two nuclear intron regions. Multiple populations of all four species were sampled, encompassing the geographic range of the widespread species and of L. pyrophilum in North Carolina. Chloroplast variation was low with only two major haplotypes resolved, one of which was found in L. iridollae and some L. michauxii, the other being shared widely. ITS data indicated a very close relationship between L. superbum and L. pyrophilum. One nuclear intron (alkaline phytase) likewise supported a close relationship between L. michauxii and L. iridollae, with L. pyrophilum sharing a haplotype with samples of L. superbum from populations widely scattered in eastern North America, while other L. superbum samples had more divergent haplotypes. The other intron (ankyrin kinase) showed more haplotypes but this diversity was widely shared between taxa. We find no evidence that L. pyrophilum is conspecific with L. iridollae, and little indication that it is a hybrid species; rather it is likely a recent isolate from L. superbum.

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1 - North Carolina State University, Department of Plant Biology, Campus Box 7612, Raleigh, NC, 27695, USA
2 - United States Army, Directorate of Public Works, Endangered Species Branch, Fort Bragg, NC , 28310, USA
3 - US Army Corps of Engineers, US Army Engineer Research and Development Center, PO Box 9005, Champaign, IL, 61826, USA

Species complex
edaphic specialization

Presentation Type: Oral Paper:Papers for Topics
Session: 21
Location: Cottonwood B/Snowbird Center
Date: Monday, July 27th, 2009
Time: 3:15 PM
Number: 21009
Abstract ID:634