The classification of American Salix (willows) is updated to account for nomenclatural changes, new species and sections, and new data. Evolutionary relationships, biology, and nomenclatural difficulties in the genus are briefly discussed. A preliminary, simplified key to sections is presented along with a synopsis of subgenera, sections, and subsections. One new section and two new subsections are described. Six new combinations are also made. The important literature is cited.
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Robert D. Dorn (1976) studied this question.
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