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Schoenoplectus robustus (Pursh) M.T. Strong
Sturdy bulrush, Leafy Three-square
Synonym(s): Bolboschoenus robustus, Scirpus maritimus var. agonus, Scirpus maritimus var. macrostachyus, Scirpus robustus
USDA Symbol: scro5
USDA Native Status: L48 (N), CAN (N)
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.
Bloom InformationBloom Color: Red
Bloom Time: Jul , Aug , Sep , Oct
, 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
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Wildflower Center Seed BankLBJWC-1261
Collected 2013-02-17 in Brazoria County by Lady Bird Johnson Wildflower Center
Record Last Modified: 2010-10-03
Research By: TWC Staff