Galanthus (convolute). He merged "Nivalis" and "Plicati" into series "Galanthus", and divided "Latifolii" into two subseries, "Glaucaefolii" and "Viridifolii" . Early molecular phylogenetic studies confirmed the genus was monophyletic and suggested four clades, which were labelled as series, and showed that Davis' subseries were not monophyletic. An expanded study in 2013 demonstrated seven major clades corresponding to biogeographical distribution. This study used nuclear encoded nrITS (Nuclear ribosomal internal transcribed spacer), and plastid encoded "matK" (Maturase K), "trnL-F", "ndhF", and "psbK–psbI", and examined all species recognised at the time, and also two naturally occurring putative hybrids. The morphological characteristic of vernation that
Luzula nivalis wide range of mainly moist habitats and , including wet meadows, snow patches, seepages, along the margins of ponds, marshes, streams (and other water bodies) as well as tundra, slopes and ridges. Occasionally "L. nivalis" has been found on dry sites including gravel, sand, silt, clay, till. Luzula nivalis Luzula nivalis, commonly known as arctic wood-rush or less commonly as snowy wood-rush (both names are used with or without hyphenation), is a species of perennial rushes endemic to Canada, Greenland, Alaska, and Northern Europe in Scandinavia. It was described by Polunin (1940) as one of the most abundant, ubiquitous, and