We present a new worldwide phylogenetic classification of 11 506 grass species in 768 genera, 12 subfamilies, seven supertribes, 52 tribes, five supersubtribes, and 90 subtribes; and compare two phylogenetic classifications of the grass family published in 2015 (Soreng et al. and Kellogg). The subfamilies (in descending order based on the number of species) are Pooideae with 3968 species in 202 genera, 15 tribes, and 30 subtribes; Panicoideae with 3241 species in 247 genera, 13 tribes, and 19 subtribes; Bambusoideae with 1670 species in 125 genera, three tribes, and 15 subtribes; Chloridoideae with 1602 species in 124 genera, five tribes, and 26 subtribes; Aristidoideae with 367 species in three genera, and one tribe; Danthonioideae with 292 species in 19 genera, and one tribe; Micrairoideae with 184 species in eight genera, and three tribes; Oryzoideae with 115 species in 19 genera, four tribes, and two subtribes; Arundinoideae with 40 species in 14 genera, two tribes, and two subtribes; Pharoideae with 12 species in three genera, and one tribe; Puelioideae with 11 species in two genera, and two tribes; and the Anomochlooideae with four species in two genera, and two tribes. We also include a radial tree illustrating the hierarchical relationships among the subtribes, tribes, and subfamilies. Newly described taxa include: supertribes Melicodae and Nardodae; supersubtribes Agrostidodinae, Boutelouodinae, Gouiniodinae, Loliodinae, and Poodinae; and subtribes Echinopogoninae and Ventenatinae.

A re-assessment of members of the family Saxifragaceae in the Canadian Arctic Archipelago is presented as a traditional key and annotated checklist that recognizes 17 taxa. The information on which this paper is based is recorded in a developing DELTA database that aims to collect the following data: place of valid publication; synonymy, usually limited to names that have been associated with the Canadian Arctic; common name(s), if applicable; vegetative and floral morphological characters; data on the distribution, including information about the northernmost record of the taxon; habitat preferences of each species; notes on the species as an environmental indicator; indigenous knowledge; and expanded notes conveying additional information. The database also contains maps, illustrations of characters useful for identification, and colour photographs and line drawings of the taxa. Appendices list characters recorded in the database, brief taxonomic notes, and a sample species description. The data are available on the Internet at http://biodiversity.uno.edu/delta/ as natural-language descriptions and as an INTKEY interactive identification and information-retrieval package for Windows.Résumé : Les auteurs présentent une ré-évaluation des membres de la famille des Saxifragaceae de l'archipelle Arctique Canadien, sous forme d'une clé traditionnelle et d'une liste annotée reconnaissant 17 taxons. L'information sur laquelle ce travail est basé est enregistrée dans une banque de données DELTA, en développement, qui vise à réunir les informations suivantes : localisation de publications valides, synonymie habituellement limitée aux noms qui ont été associés avec l'Arctique Canadien, nom(s) commun(s) si approprié, caractères morphologiques végétatifs et floraux, données sur la distribution, incluant de l'information sur la mention la plus nordique pour le taxon, habitats préférés de chaque espèce, notes sur l'espèce comme indicateur environnemental, connaissance par les indigènes, et un ensemble de notes sur des informations additionnelles. La banque de données comporte également des cartes, des illustrations de caractères utiles pour l'identification, des photographies en couleurs ainsi que des dessins de ces taxons. Les appendices présentent les caractères enregistrés dans la banque de données, de courtes notes taxonomiques et un échantillon de description de l'espèce. Les données sont disponibles par Internet à http://biodiversity.uno.edu/delta/ sous forme de descriptions en langage naturel et sous forme d'un fichier transférable INTKEY pour identification interactive et retrait d'informations sur MS-Windows. Mots clés : Arctique, Canada, DELTA, Internet, Saxifragaceae, taxonomie. [Traduit par la Rédaction] Aiken et al. 2036 Porsild (1957Porsild ( , 1964 and incorporated relevant information published since the latter date. The Poaceae was chosen as the first family to be revised, for reasons that were documented. The DELTA format (Description Language for Tax-Can.

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Tuktut Nogait National Park is located in the Melville Hills in the northeastern corner of mainland Northwest Territories in Canada's Southern Arctic Ecozone. The first major floristic survey of the Melville Hills region was conducted in 1990 as part of a natural resource inventory to determine its suitability as a National Park. We studied the flora and made extensive plant collections in Tuktut Nogait National Park and the Melville Hills region in 2009. Here, we present a comprehensive annotated checklist to the region's vascular plant flora based on a review of all existing and our own new collections. This includes the citation of all specimens examined, colour photographs for a subset of taxa and detailed taxonomic comments. The Melville Hills flora comprises 268 taxa (265 species and three additional infraspecific taxa), a 16% increase from the first survey, 215 of which are known from Tuktut Nogait National Park. Forty-eight taxa are newly recorded for the region and 54 taxa are newly recorded for Tuktut Nogait National Park. Noteworthy records include range extensions for Botrychium lunaria, Carex concinna, Draba borealis, Myriophyllum sibiricum, Plantago eriopoda, Poa alpina, Poa ammophila, Puccinellia banksiensis, Salix arbusculoides, and Selaginella selaginoides. The flora includes 19 vascular plant species of potential conservation concern in the Northwest Territories, including six assessed as "May Be At Risk", of which one occurs in the Park and 13 assessed as "Sensitive", of which eight occur in the Park.

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