Butomus umbellatus L. (Butomaceae), flowering rush, is an emergent, perennial, wetland species of lake margins or slow-moving waterways. Native to Europe and western Asia, its initial North American introduction—most likely as a water garden escape—was reported from the St. Lawrence River (1897), and by 1929 it was established in Lake Champlain, Vermont (Les and Mehrhoff 1999). Based on herbarium records, plants were subsequently discovered in Connecticut (1943) and Maine (1999), where stations are currently known from a few counties, respectively. In New England, it remains most abundant and invasive in Vermont.

During a 2006 floristic inventory related to a weed management project, Butomus was first observed in Massachusetts flowering on the western shore of the eastern basin of Winter Pond, Middlesex Co., Winchester (GeoSyntec 2006). Sterile specimens were later vouchered in 2008 from the north shore...

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