Salix atrocinerea and related willows in eastern Massachusetts
Alexey Zinovjev and Irina Kadis
34 pp., 54 ill., 2009The European rusty willow, Salix atrocinerea (S. cinerea ssp. oleifolia) introduced to eastern North
America is considered a distinct species. Diagnostic characters separating
S. atrocinerea from related willows occurring in eastern Massachusetts are discussed.
S. cinerea is present in Massachusetts along with
S. atrocinerea, though it is more rare. Naturalization in eastern North
America of other European willows from the same section,
S. aurita and
S. caprea, needs confirmation. A possibility
of hybridization between the alien
S. atrocinerea and native
S. humilis is
demonstrated through obtaining hybrid seedlings from
S. humilis seeds
collected in the Boston area.
S. atrocinerea is known to be invasive in
some countries outside the United States. In New England, its
hybridization with the native willows may create a threat for their existence
in addition to displacement.
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This brochure is an updated version of the article originally published in
January 2009 at