The distribution of 40 species of Laminariales is described for the northeast Pacific coast from Santa Margarita Island, Baja California, Mexico to Attu Island, Alaska, U. S. A. In general this coast can be described as an area of gradual floristic change which can, however, be divided into seven broad transitional regions separated by regions of no floristic change. The relative distribution of Lessoniaceae, Alariaceae, and Laminariacea along the northeast pacific coast defines three distinct coastal floras: a southern segment from Santa Margarita Island to the Strait of Juan de Fuca; a northern segment from Hope Island, British Columbia, Canada, to Yakutat, Alaska; and a western segment from Kodiak Island, Alaska to Attu Island, Alaska.
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Louis D. Druehl (1970) studied this question.