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Scirpus expansus (Cyperaceae), commonly known as wood bulrush, is an herbaceous emergent wetland plant native to the eastern United States and eastern Canada. It is known to grow in various wetland types including, marshes and wet meadows, marshes and seepage areas , marshy ground, river ditches and banks, along streams in forests , grassy marshes, meadows fields, and wetland margins. It has a coefficient of conservatism, a measure of plants tolerance to disturbance and specificity of habitat, of 5 in Michigan and 6 in New York.

The species was first described in 1943 by Fernald. Previously it was called Scirpus sylvaticus, a European native. Reports of Scirpus sylvaticus in North America probably represent a misapplication of this names to Scripus expansus and S. microcarpus. This species can hybridize with Scirpus microcarpus ( = Scirpus expansus x Scirpus microcarpus) and is known from one specimen in Albany County, NY. , and is aparently common in New England. This hybrid was the basis for the names S. sylvaticus var. bissellii Fernald, S. expansus forma bissellii (Fernald) Fernald, and S. rubrotinctus forma radiosus Fernald.

It is listed as Endangered in Indiana and Kentucky, and listed as Threatened in Ohio. This species is not listed federally.