title: A subgeneric classification of Selaginella (Selaginellaceae).
abstract: OBJECTIVE
  The lycophyte family Selaginellaceae includes approximately 750 herbaceous species worldwide, with the main species richness in the tropics and subtropics. We recently presented a phylogenetic analysis of Selaginellaceae based on DNA sequence data and, with the phylogeny as a framework, the study discussed the character evolution of the group focusing on gross morphology. Here we translate these findings into a new classification.
  
  
  METHODS
  To present a robust and useful classification, we identified well-supported monophyletic groups from our previous phylogenetic analysis of 223 species, which together represent the diversity of the family with respect to morphology, taxonomy, and geographical distribution. Care was taken to choose groups with supporting morphology.
  
  
  RESULTS
  In this classification, we recognize a single genus Selaginella and seven subgenera: Selaginella, Rupestrae, Lepidophyllae, Gymnogynum, Exaltatae, Ericetorum, and Stachygynandrum. The subgenera are all well supported based on analysis of DNA sequence data and morphology. A key to the subgenera is presented.
  
  
  CONCLUSIONS
  Our new classification is based on a well-founded hypothesis of the evolutionary relationships of Selaginella, and each subgenus can be identified by a suite of morphological features, most of them possible to study in the field. Our intention is that the classification will be useful not only to experts in the field, but also to a broader audience.
authors.affiliation: Systematic Biology, Department of Organismal Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, SE-752 36 Uppsala, Sweden.
authors.forename: Stina
authors.initials: S
authors.lastname: Weststrand
authors.affiliation: Systematic Biology, Department of Organismal Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, SE-752 36 Uppsala, Sweden petra.korall@ebc.uu.se.
authors.forename: Petra
authors.initials: P
authors.lastname: Korall
mesh_terms: D005075:Biological Evolution; D010802:Phylogeny; D018515:Plant Leaves / Q000033:anatomy & histology / Q000145:classification / Q000235:genetics; D032503:Selaginellaceae / Q000033:anatomy & histology / Q000145:classification* / Q000235:genetics; D017422:Sequence Analysis, DNA
keywords: Selaginellaceae; classification; key; lycophytes; morphology; phylogeny; subgenera