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Citation for Study 1550

About Citation title: "Phylogeny and biogeography of Isoetes (Isoetaceae) based on nuclear and chloroplast DNA sequence data".
About This study was previously identified under the legacy study ID S1495 (Status: Published).


Hoot S., Taylor W., & Napier N. 2006. Phylogeny and biogeography of Isoetes (Isoetaceae) based on nuclear and chloroplast DNA sequence data. Systematic Botany, null.


  • Hoot S.
  • Taylor W.
  • Napier N.


Despite its ancient origins, worldwide distribution, and adaptation to diverse habitats, IsoŽtes 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 IsoŽtes 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 Mediterannean 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.

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