Schoenoplectus robustus (Pursh) M.T. Strong
Sturdy bulrush, Leafy Three-square
Cyperaceae (Sedge Family)
Synonym(s): Bolboschoenus robustus, Scirpus maritimus var. agonus, Scirpus maritimus var. macrostachyus, Scirpus robustus
USDA Symbol: scro5
Reddish-tan, ovoid to cylindrical spikelets clustered closely against a sharply triangular stem.
Three-squares are an important group of sedges for wildlife. Their seeds are among the most common foods of ducks and marsh birds. Their stems and roots are eaten by muskrats and geese, and they provide cover for many birds and animals. The larger marsh species Olney Three-square (S. americanus) reaches a height of 10 (3 m); its small spikelets are all gathered along one side of the stalk near the top.
From the Image Gallery
Bloom InformationBloom Color: Red
Bloom Time: Jul , Aug , Sep , Oct
DistributionUSA: AL , AR , CA , CT , DE , FL , GA , LA , MA , MD , ME , MS , NC , NH , NJ , NY , PA , RI , SC , TX , VA , VT
Canada: NB , NS
Native Distribution: Maine and Nova Scotia south to Florida and west to Texas.
Native Habitat: Brackish, coastal marshes.
Growing ConditionsWater Use: High
Light Requirement: Sun
Soil Moisture: Wet
CaCO3 Tolerance: Medium
National Wetland Indicator Status
Wildflower Center Seed BankLBJWC-1261 Collected 2009-02-16 in Brazoria County by Lady Bird Johnson Wildflower Center
Additional resourcesUSDA: Find Schoenoplectus robustus in USDA Plants
FNA: Find Schoenoplectus robustus in the Flora of North America (if available)
Google: Search Google for Schoenoplectus robustus
MetadataRecord Modified: 2010-10-03
Research By: TWC Staff