Carex densa Provisional Herbaceous Alliance
Dense sedge marshes

Summary Information

  • Primary Life FormHerb
  • Elevation0-1500 m
  • State RarityS2?
  • Global RarityG2?
  • DistributionUSA: CA, OR, WA (TJM2)
  • Endemic to CaliforniaNo
  • Endemic to California Floristic Province and DesertsNo
  • Date Added2009/09/01

Characteristic Species

Carex densa is dominant or co-dominant in the herbaceous layer with Avena barbata, Carex praegracilis, Dipsacus sativus, Geranium dissectum, Holcus lanatus, Juncus spp., Lolium perenne, Mentha pulegium, Ranunculus californicus, Wyethia glabra and Zigadenus micranthus. Emergent shrubs may be present at low cover, including Baccharis pilularis.

Vegetation Layers

Herbs < 1 m; cover is continuous.


Saturated bottomlands and flats, freshwater seeps. Soils are silty to sandy, and seasonally or intermittently saturated. The USFWS Wetland Inventory (1996 national list) recognizes Carex densa as an OBL plant.

Other Habitat, Alliance, and Community Groupings

MCV (1995) Not treated
NVCS (2009) Not treated
Calveg Wet grasses and forbs
Holland Freshwater seep
Munz Freshwater marsh
WHR Fresh emergent wetland
CDFW CA Code 45.165.00