title: Taxonomic placement of Paphiopedilum canhii (Cypripedioideae; Orchidaceae) based on cytological, molecular and micromorphological evidence.
abstract: Paphiopedilum canhii was discovered in Northern Vietnam. Since its description in 2010, it has caused a stir among taxonomists due to its interesting mixture of morphological features, i.e. marbled, relatively thick leaves, flowers similar to species classified in the section Barbata, and unique, large staminodial shield. On the basis of these features, it is difficult to classify the species to existing infrageneric units. Using cytological data, phylogenetic analyses based on plastid and nuclear genes and the study of the adaxial epidermis of the leaves and gynostemium structure obtained from Scanning Electron Microscopy (SEM) and Light Microscopy (LM), the taxonomic position of P. canhii was determined. These results suggest that P. canhii forms an independent phylogenetic line within the genus Paphiopedilum deserving subgeneric status, already proposed by Braem and Gruss (2011) as Megastaminodium.
authors.affiliation: Department of Molecular Evolution, University of Gdańsk, Wita Stwosza 59, PL-80-308 Gdańsk, Poland. Electronic address: marcin.gorniak@biol.ug.edu.pl.
authors.forename: Marcin
authors.initials: M
authors.lastname: Górniak
authors.forename: Dariusz L
authors.initials: DL
authors.lastname: Szlachetko
authors.forename: Agnieszka K
authors.initials: AK
authors.lastname: Kowalkowska
authors.forename: Jerzy
authors.initials: J
authors.lastname: Bohdanowicz
authors.forename: Chu Xuan
authors.initials: CX
authors.lastname: Canh
mesh_terms: D002467:Cell Nucleus / Q000235:genetics; D032461:Chromosomes, Plant; D035264:Flowers / Q000166:cytology / Q000235:genetics; D008855:Microscopy, Electron, Scanning; D029595:Orchidaceae / Q000145:classification / Q000166:cytology / Q000235:genetics*; D010802:Phylogeny; D018515:Plant Leaves / Q000166:cytology / Q000235:genetics; D018087:Plastids / Q000235:genetics; D017422:Sequence Analysis, DNA
keywords: Chromosome number; Micromorphology; Molecular phylogeny; Paphiopedilum; SEM