4 Works

Data from: Molecular phylogenetics and the evolution of fruit and leaf morphology of Dichaea (Orchidaceae: Zygopetalinae)

Kurt M. Neubig, Norris H. Williams, W. Mark Whitten & Franco Pupulin
BACKGROUND AND AIMS: The orchid genus Dichaea, with over 100 species found throughout the neotropics, is easily recognized by distichous leaves on long stems without pseudobulbs and flowers with infrastigmatic ligules. The genus has previously been divided into four sections based primarily on presence of ovary bristles and a foliar abscission layer. The aim of this work is to use DNA sequence data to estimate phylogenetic relationships within Dichaea and map the distribution of major...

Data from: An expanded plastid phylogeny of Marsilea with emphasis on North American species

W. Mark Whitten, Colette C. Jacono & Nathalie S. Nagalingum
Ferns of the genus Marsilea (water clover) are potentially invasive aquatic and wetland plants. They are difficult to identify to species because of subtle diagnostic characters, the sterile condition of many specimens, and unresolved taxonomic problems. We sequenced four plastid regions (rbcL, rps4, rps4-trnS spacer, and trnL-F spacer) from 223 accessions across ca. 38 species. Our goals were to: 1) attempt to identify problematic Marsilea specimens from the southeastern U.S., and 2) assess species delimitation...

Data from: Floral convergence in Oncidiinae (Cymbidieae; Orchidaceae): an expanded concept of Gomesa and a new genus Nohawilliamsia

Mark W. Chase, Norris H. Williams, Aparacida Donisete De Faria, Kurt M. Neubig, Maria Do Carmo E. Amaral & W. Mark Whitten
BACKGROUND: Floral morphology, particularly the angle of lip attachment to the column, has historically been the fundamental character used in establishing generic limits in subtribe Oncidiinae (Orchidaceae), but it has also been long recognized that reliance on this character alone has produced a highly artificial set of genera. In essence, lip/column relationships reflect syndromes associated with pollinator preferences; most genera of Oncidiinae as previously defined have consisted of a single floral type. Here, the degree...

Data from: Species and phylogenetic nomenclature

Nico Cellinese, David A. Baum, Mishler D. Brent & Brent D. Mishler
The motivation for the development of phylogenetic nomenclature (originally called “phylogenetic taxonomy”) was to allow biological classification (or “systematization”) to represent phylogenetic relationships, and to embody important principles such as “the untenability of paraphyletic groups” (de Queiroz and Gauthier 1990). From this starting point de Queiroz and Gauthier developed a creative new basis for systematization in which the entities are not ranked taxa but clades (de Queiroz and Gauthier 1990, 1992, 1994; de Queiroz 1992,...

Registration Year

  • 2012

Resource Types

  • Dataset


  • Florida Museum of Natural History
  • University of Florida
  • Royal Botanic Gardens
  • National Institute of Amazonian Research
  • University of Costa Rica
  • Royal Botanic Garden Sydney
  • State University of Campinas