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The boreal macrobioclimate in North America spreads throughout a vast territory framed in the north by the polar (arctic) area and in the south by the temperate macrobioclimate. Biogeography, bioclimates (thermotypes and ombrotypes), and continentality make possible a high diversity of boreal vegetation, which in their mature dynamical stages is always represented by a conifer forest vegetation structured by trees. The climactical forests of the recognized vegetation series belong to a two well-differentiated phytosociological classes: Linnaeo americanae-Piceetea marianae and Tsugetea mertensiano-heterophyllae. We present in this special publication a synthesis on boreal macrobioclimate in North America and the checklist of the boreal vegetation series recognized throughout the North American territories including their full geobotanical diagnosis and their syntaxonomical scheme.