02184nam a2200205   4500008004100000245010800041210007100149260001200220300001400232490000700246520150100253653001701754653001501771653001201786653001401798100001501812700001701827700001701844856011701861       2006                        eng d00aPhylogeny and biogeography of Isoëtes (Isoëtaceae) based on nuclear and chloroplast DNA sequence data0 aPhylogeny and biogeography of Isoëtes Isoëtaceae based on nuclea  c2006///  a449 - 4600 v313 aDespite its ancient origins, worldwide distribution, and adaptation to diverse habitats, Isoëtes species have a highly conserved morphology, making it difficult to resolve phylogenetic relationships using morphological characters. In this paper, we report the results from various analyses (maximum parsimony, maximum likelihood, and Bayesian inference) for Isoëtes species from around the world based on nucleotide sequences from the nuclear internal transcribed spacer (ITS) and chloroplast atpB/rbcL intergenic spacer regions. The trees resulting from our analyses of the combined data contain six major well-supported clades (bootstrap ≥ 90%, posterior probabilities = 1.00): A clade with possible Gondwanan affinities (I. australis, I. coromandelina, I. panamensis, I. cubana, I. jamaicensis); a South African clade (I. capensis, I. toximontana, I. stellenbossiensis, I. stephansenii); a largely Northern Hemisphere clade (I. nuttallii, I. orcuttii, I. minima, I. dixitei, I. abyssinica, I. olympica, I. longissima, I. velata); an Asian/Australasian clade (I. drummondii, I. gunnii, I. pusilla, I. kirkii, I. muelleri, I. taiwanensis, I. japonica, I. yunguiensis, I. habbemensis); a Mediterranean clade (I. histrix and I. setacea); and a poorly resolved clade consisting of 12 new world species (American species complex). Our results are compared to past classifications and various biogeographical scenarios are explored. © Copyright 2006 by the American Society of Plant Taxonomists.10aBiogeography10aIsoetaceae10aIsoetes10aPhylogeny1 aHoot, S.B.1 aTaylor, W.C.1 aNapier, N.S.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-67650146436&partnerID=40&md5=c418d4b55db9dd7f2436a8d3189f1552