Systematics Section / ASPT
Mort, Mark E. , Wendlandt, Blair N. , Santos-Guerra, Arnoldo , Elgethun, Megan .
Phylogeny and evolution of the Macaronesian genus Monanthes (Crassulaceae) inferred from multiple DNA datasets.
Broad phylogenetic analyses of Crassulaceae recover a well supported clade comprising three primarily Macaronesian genera: Aichryson, Aeonium, and Monanthes. The latter genus comprises approximately 10 species of diminutive herbs that possess loose to dense rosettes of highly succulent leaves. The flowers of Monanthes are likewise small, but distinctive within Crassulaceae by possessing large petaloid nectary scales. The majority of species within the genus are perennials of dry, rocky habitats, but one species ( M. icterica ) is an annual, that also differs in base chromosome number (x= 10 versus x = 18) from the remainder of the genus. Previous phylogenetic analyses of the Macaronesian clade of Crassulaceae have been equivocal on the placement of M. icterica , with some analyses suggesting that the species might not be part of the genus, despite its similar floral morphology. Furthermore, initial analyses of the genus suggested that one widespread species, M. laxiflora was not monophyletic. To test the monophyly of Monanthes , the phylogenetic placement of M. icterica , and limits of M. laxifora , we conducted MP and ML analyses of nrDNA ITS and several cpDNA markers (trnL-trnF, psbA-trnH, and ycf6-psbM) and a combined ITS/cpDNA data set for all species within the genus, including multiple populations of M laxiflora from each island on which it occurs. Our analyses place the annual M. icterica within a well supported Monanthes clade. The combined ML topology is used to assess patterns of morphological and chromosomal evolution and inter island dispersal within the genus
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1 - University of Kansas, Department of Ecology & Evolutionary Biology, Natural History Museum and Biodiversity Research Center, 1200 Sunnyside Avenue, Lawrence, Kansas, 66045-7534, USA
2 - University of Kansas, Department of Ecology & Evolutionary Biology, Natural History Museum and Biodiversity Research Center, 1200 Sunnyside Avenue, Lawrence, Kansas, 66045-7534, USA
3 - Jardin de Aclimatacion de la Orotava, Calle Retama Numero 2, Puerto de la Cruz, Teneri, Canary Islands, E-38040, Spain
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 2:15 PM