Scirpus fluviatilis (Torr.) A. Gray - River Bullrush


 

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Scirpus fluviatilis - (image 1 of 4)

 

Taxonomy

Family: Cyperaceae

Habitat

Marshes, standing water, freshwater shores. Tolerant of alkalinity.

Associates

In marshes with Alisma subcordatum, Calamagrostis canadensis, Impatiens capensis, Iris virginica shrevei, Leersia oryzoides, Penthorum sedoides, Polygonum coccineum, Rumex verticillatus, Sagittaria latifolia, Scirpus validus creber, Sium suave, Sparganium eurycarpum, Typha latifolia.

Distribution

Widespread in southern Canada and the northern U.S., occurring as far south as VA, MO, KS, and CA.

Morphology

Herbaceous perennial from robust, tuber-bearing rhizomes. Leaves linear, more than 1 cm wide. Culms stout, 1 cm or more wide, sharply triangular. Bracts subtending inflorescence spreading, leafy, 2 or more. Stigmas 3. Achenes less than 3.5 mm long.

Notes

Flowers late May to early July

Wetland indicator: Obligate

Can occasionally dominate areas of marsh to the exclusion of other vegetation.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2005