Vascular plants of continental Northwest Territories, Canada /

Abstract

Vascular Plants of Continental Northwest Territories, Canada is a comprehensive treatment of the ferns and flowering plants of the large area lying between Hudson Bay and the Yukon Territory border, and 60° N latitude and the Arctic coast.The authors have provided keys, descriptions, and habitat and distributional information, not only for the 1112 species found in the region, but also for a number of species which might be expected to occur there. There are distribution maps for all the native species, and 978 line drawings. The work also includes a description of the area and its six phytogeographic zones, a tabulation of families, genera and species, a history of botanical collecting, a selected bibliography, a glossary and an index.Vill Résumé L'ouvrage Vascular Plants of Continental Northwest Territories, Canada constitue un recensement exhaustif des fougéres et des plantes floriferes de la partie continentale des Territoires du Nord-Ouest.Les auteurs y donnent des descriptions, des clefs d'identification, ainsi que des renseignements sur l'habitat et |'aire de distribution, non seulement des 1112 espéces découvertes dans la région mais également d'un certain nombre d'espéces qui pourraient s'y trouver. L'ouvrage comporte une carte de distribution pour chaque espéce indigene, 978 dessins au trait, une description de la région et de ses six zones phytogeéographiques, un répertoire des familles, des genres et des espéces, une histoire de l'herborisation, une bibliographie, un lexique et un index.He was accompanied here by J.B. McCanse. From there he was fortunate to obtain flights out to the Snare River Power Dam, Eastern Great Bear Lake and Norman Wells (DAO).In 1949 A.E. Porsild, while en route to Banks Island, made a side trip to the Sweet Grass Hills on Great Bear Lake (CAN); /. McT. Cowan gathered a few specimens in the Mackenzie River Delta region (CAN); P. Lawson gathered some specimens along the lower Thelon River (CAN); A.L. Wilk gathered a few specimens in the vicinity of Fort Smith (ALTA); and B.Ju. Woodruff while working with a Geodetic Survey of Canada party gathered a few specimens at Bathurst Inlet and Kigyik Lake (DAO).In 1950 W.J. Cody, accompanied by C.C. Loan, was based at Fort Smith on the 60° parallel. From here he was able to study the Salt Plains which lie a few miles west of Fort Smith (DAO). This same year D.B.O. Savile, a Canada Department of Agriculture mycologist and botanist, worked out of Chesterfield Inlet on Hudson Bay (DAO); A.L. Morrison made some collections from south of Yellowknife (ALTA); J.P. Kelsall and E.H. McEwen, Canadian Wildlife Keys to the Major Groups and Families c. Flowers enclosed or subtended by scales (glumes); plants grass-like, with jointed stems, sheathing leaves and 1-seeded fruit d. Stems usually hollow, terete or flattened; leaves 2-ranked; leaf-sheaths usually split (open)

Isolation au postglaciaire d'un bassin côtier près de Kuujjuaraapik-Whapmagoostui, en Hudsonie (Québec) : une analyse biostratigraphique diatomifère

“…Par contre, la présence de graines de Potamogeton (macrophyte aquatique) a été signalée dans la séquence d'argile silteux (L. Miousse, communication personnelle), signalant ainsi la présence d'une végétation aquatique dans la région côtière hudsonienne de l'époque. Ces macrophytes sont caractéristiques des eaux calmes à modérément agitées et peu profondes (Porsild et Cody, 1980) *Cette zone a été subdivisée en deux sous-zones (a et b) à la profondeur de 51 cm. La subdivision marque le début du déclin de la dominance de F. elliptica, ainsi que l'apparition progressive des espèces qui domineront la zone III.…”

Additions and Range Extensions to the Vascular Plant Flora of the Continental Northwest Territories and Nunavut, Canada, II

“…The specimen cited above is only the third record for the Continental District of Keewatin and is a slight extension of the range mapped by Porsild and Cody (1980) to the south.…”

“…This species was considered rare in the Northwest Territories by Porsild and Cody (1980) because it was only known in the extreme south and in the Mackenzie Mountains region. It was not included in the Rare Plants in the Northwest Territories (McJannet et al 1995) because it has a widespread circumpolar distribution.…”

“…In this paper the authors have continued to use the historic names "District of Keewatin" and "District of Mackenzie" to follow the format of Porsild and Cody (1980) Vascular Plants of Continental Northwest Territories, Canada and subsequent publications. However, continental "Keewatin" and the former northeastern portion of the District of Mackenzie are now part of the recently defined Continental Nunavut Territory.…”

Geologic studies in Alaska by the U.S. Geological Survey, 1990

“…Willows were probably most common along streams, whereas Populus may have been derived from aspen (P. tremuloides) in the forest and cottonwood (P. balsamifera) along the streams. None of the conifers present in the Colvillian pollen floras occur today on the North Slope, and several have their present northern limits far to the south (Viereck and Little, 1972 (Porsild and Cody, 1980). Although some of these taxa may have had different ecological tolerances in late Pliocene time than they do at present, the occurrence of taxa in the Colvillian pollen floras that are 1,000 km or more north of their present limits suggests that the North Slope climate during the Colvillian transgression was considerably warmer than now, and possibly warmer than the modern Anchorage area (1.5 oc mean annual air temperature), which is north of the present limits of pine.…”