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dense-flowered cordgrass (Spartina densiflora Brongn.)
NOT KNOWN TO OCCUR IN OREGON PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES

USDA Symbol: SPDE2

ODA rating: A and T
Spartina risk assessment
Noxious weed listing process

 
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Images courtesy of Mary Pfauth, Portland State University.
 
 
 
Description
Perennial aquatic grass. Grows 1 to 5 feet. tall. Leaf (blade) margins in-rolled, 1/8 to 1/3 inches wide at the base. Blade at a 15-35 degree angle to the stem. Internodes firm. The inflorescence narrow, dense, and cylindrical with branches erect and overlapping. Rhizome usually lacking or short and thick. Dense-flowered cordgrass is similar to common cordgrass (S. anglica), salt-meadow cordgrass (S. patens), and smooth cordgrass (S. alterniflora ). A detailed key is recommended for positive identification.
 
Impacts
This plant is a non-native grass species that invades the middle tidal zones in estuaries. It is not the primary invader of mudflats. Instead, it adapts to the lower to middle salt marsh areas where it aggressively out competes native grasses, sedges and salicornia stands.
 
Distribution in Oregon
Dense-flowered cordgrass has not been positively identified in Oregon, although Pacific Northwest sites are known in California and Washington state.
 
Biological controls
Biological control agents are not used on "A" listed weeds in Oregon. If this weed is found in the state it will be managed for eradication or containment.
 
Informational links
Oregon WeedMapper