A phytosociological survey of the chionophilous communities of western North America. Part II: boreal associations.

摘要

To continue our study on the chionophilous communities of western North America, this report presents a phytosociological survey of communities growing in a boreal macroclimate. Combining the Braun-Blanquet approach with numerical analysis, 378 releves were ordered and classified by tabular and average linkage cluster analyses, revealing 11 associations in the classes Salicetea herbaceae, Loiseleurio-Vaccinietea, and Carici rupestris-Kobresietea bellardii. The following new syntaxa are described and typified: Carici podocarpae-Anemonetalia parviflorae, Solidagini arcticae-Dryadion alaskensis, Taraxaco alaskani-Salicion rotundifoliae, Vaccinio mini-Betuletalia exilis, Polygono plumosi-Cassiopion tetragonae, Arnico lessingii-Cassiopetum tetragonae, and Carici podocarpae-Betuletum exilis..