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This web service provides help with identification of plants found in the wild, mostly in eastern Massachusetts, though occasionally questions come from elsewhere in the world (see map). It may also be used as a tool for reporting plants (such as invasive or rare). Cultivated plants are not discussed here.
Salix atrocinerea and related willows in eastern Massachusetts A. Zinovjev and I. Kadis 2009
Willows of Southcentral Alaska. Willows of Interior Alaska Dominique M. Collet 2002 and 2004
Macroevolutionary theory on macroecological patterns Peter W.Price 2003
Invasive Plants. Reports