''Schoenoplectus pungens'' is a species of flowering plant in the sedge family known as common threesquare, common three-square bulrushFlora of North America
/ref> and sharp club-rush. It is a

herbaceous Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials. Definitions of "herb" and "herbaceous" The fourth edition of ...

emergent plant that is widespread across much of

North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating Direction (geometry), direction or geography. Etymology T ...

and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

as well as

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

and

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

.Kew World Checklist of Selected Plant Families
/ref>Acevedo-Rodríguez, P. & Strong, M.T. (2012). Catalogue of seed plants of the West Indies. Smithsonian Contributions to Botany 98: 1-1192.

Habitat

Threesquare is found in open, sun-lit marshes and along the shores of lakes and ponds, in water up to deep. It is resistant to fire.

Description

''Schoenoplectus pungens'' is a long-lived perennial herb up to tall. The foliage is dark green, rough and dense. The small flowers are grouped in dense spikelets, with of 1–7 spikelets on each stem. The seeds are brown. It is closely related to ''S. americanus,'' and many ''S. pungens'' specimens have long been misidentified as ''S. americanus.'' File:Schoenoplectus spp Sturm11.jpg, Painting by Jacob Sturm in ''Deutschlands Flora in Abbildungen'' File:Schoenoplectus pungens - Botanical Garden, University of Frankfurt - DSC02704.JPG, At the Botanical Garden of Goethe University Frankfurt File:Schoenoplectus pungens - Flickr - Kevin Thiele.jpg

References

External links

Jepson Manual TreatmentWashington Burke MuseumPhoto gallery
{{Authority control pungens Flora of Northern America Flora of Southern America Flora of Europe Flora of Australia Plants described in 1805 Freshwater plants