New Varieties of Western Willows.

Increasing collections of West American Salices make possible better interpretations of the variations of expression noted in different species. The present paper adds two varieties to Salix melanopsis Nuttall, that one of the western long-leaf or sandbar willows most closely related to the eastern S. interior Rowlee (S. longifolia Muhl.). Continuing study of the abundant Alaskan collections made by Dr. and Mrs. Setchell and others have revealed significant variations in S. fuscescens And., S. reticulata L. and S. ovalifolia Trautvetter. Descriptions of these as new varieties should make these species more readily comprehended. Type specimens are indicated and available herbarium specimens are cited. The following initials are used to designate the herbariums in which the collections examined are housed: CAS, California Academy of Sciences; CRB, Carleton R. Ball; PANS, Philadelphia Academy of Natural Sciences; SU, Stanford University; UC, University of California; and USN, U. S. National Herbarium. The courtesies shown by the institutions named are appreciated, as is also the assistance received from Dr. Setchell and others.