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Species
Information
- dense-flowered
cordgrass
- Spartina
densiflora Brongn.
- USDA
Symbol: SPDE2
- Oregon
Noxious Weed Designation: A, T
- Pictures
ALERT: PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES
Identification:
Perennial aquatic grass. Grows 1 to 5 ft. tall. Leaf (blade) margins in-rolled, 1/8 to 1/3 in. 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. Dense-flowered cordgrass has not yet been positively identified in Oregon, although Pacific Northwest sites are known in California and Washington state.
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 saltmarsh areas where it aggressively outcompetes native grasses, sedges and salicornia stands.
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.
Oregon
Maps of Dense-flowered Cordgrass Distribution
Links:
USDA
Plants Database information on dense-flowered cordgrass
GRIN
Database information on dense-flowered cordgrass
Oregon Department
of Agriculture information on dense-flowered cordgrass
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