Cyperus pseudovegetus

Spikelets green, maturing brown. Bracts 5-9, mostly horizontal. Through error this species is sometimes called C. virens. Cyperus virens has sharply angled stems with prickly edges; C. pseudovegetus has smooth, obtusely angled stems.

Freshly harvested seeds are dormant. After-ripening at 35 F (2 C) for 10-29 weeks breaks dormancy. Justice germinated seed at alternating temperatures of 68 F (20 C) in darkness and room temperature in light. Ninety percent of seeds germinated that were stored dry at room temperature for 8 1/2 months. Some seeds were viable after 4 years of storage, but none were viable after 7 years (Justice 1957).

Marsh flatsedge is common in moist places throughout Louisiana and east and southeast Texas. It ranges through the Gulf States, north to New Jersey.

Marshes, ditches, depressions, shorelines, ditches, and wet low prairies.