Introduction
Barren Complexes: B2.1B2.1 Lichens on Lava (Seward Peninsula) - B3d.1B3d.1 Acidic mountain complexes (St. Lawrence Is.) - B3e.1B3e.1 Acidic mountain complexes (Brooks Range) - B3e.2B3e.2 Acidic mountain complexes (NW Alaska) - B3e.3B3e.3 Acidic mountain complexes (Kuskokwim Mtns.) - B4d.1B4d.1 Nonacidic mountain complexes (Seward Peninsula) - B4d.2B4d.2 Nonacidic mountain complexes (St. Lawrence Is.) - B4e.1B4e.1 Nonacidic mountain complexes (Brooks Range) - B4e.2B4e.2 Nonacidic mountain complexes (NW Alaska)
Non-Tussock Graminoid Tundras: G3.1G3.1 Moist nonacidic tundra (N. Arctic Coastal Plain) - G3.2G3.2 Moist nonacidic tundra (St. Lawrence Is.) - G3.3G3.3 Moist nonacidic tundra (Arctic Foothills, Seward Peninsula)
Tussock Graminoid Tundras: G4.1G4.1 Tussock tundra (entire map) - G4.2G4.2 Lichen-rich tussock tundra (Seward Peninsula) - G4.3G4.3 Tussock tundra on sands (Arctic Coastal Plain)
Prostrate Dwarf-Shrub Tundras: P2.1P2.1 Dry tundra (St. Matthew Is.)
Erect Dwarf-Shrub Tundras: S1.1S1.1 Shrubby, tussock tundra (NE Alaska) - S1.2S1.2 Dwarf-shrub, lichen tundra (NW Alaska) - S1.3S1.3 Dwarf-shrub tundra on volcanic rock (Yukon-Kuskokwim Delta) - S1.4S1.4 Dwarf-shrub, lichen tundra (Kuskokwim Mtns.)
Low-Shrub Tundras: S2.1S2.1 Willow-birch tundra (entire map) - S2.2S2.2 Alder shrublands (entire map)
Wetlands: W1.1W1.1 Wet acidic coastal complex (N Alaska) - W1.2W1.2 Wet nonacidic coastal complex (N Alaska) - W2.1W2.1 Wet acidic complex (N Alaska, Seward Peninsula) - W2.2W2.2 Wet nonacidic complex (Subzone D, N Alaska) - W3.1W3.1 Wet acidic complex with tussock tundra (W Alaska) - W3.2W3.2 Wet acidic complex with dwarf-shrub tundra (lower parts of Yukon-Kuskokwim Delta) - W3.3W3.3 Wet acidic complex with low-shrub tundra (Yukon-Kuskokwim Delta) - W3.4W3.4 Wet acidic complex with dwarf-shrub tundra (inland parts of Yukon-Kuskokwim Delta) - W3.5W3.5 Wet acidic complex (Nunivak Is.) - W3.6W3.6 Wet nonacidic complex (warmer parts of NW Alaska) - W3.7W3.7 Wet coastal saline tundra (Yukon-Kuskokwim Delta)

W3.1 Wet acidic complex with tussock tundra (W. Alaska)

Wet sedge, moss communities (comm. 54) on wet acidic sites, with moist communities (G4.1, comm. 41) on higher microsites. Seward Peninsula and Selawik Basin, Subzone E.

(See G4.1)

Plant Communities:

Community 41

Sphagno-Eriophoretum vaginati, tussock tundra on acidic fine grained soils (Walker et al. 1994) (Imnavait Creek).

• Tussock sedge
  • Eriophorum vaginatum
  • Carex bigelowii
• Erect dwarf shrub
  • Betula nana
  • Ledum decumbens
  • Vaccinium vitis-idaea
  • Empetrum hermaphroditum
  • Cassiope tetragona
  • Rubus chamaemorus
• Forb
  • Pyrola grandiflora
  • Bistorta plumosa
  • Saxifraga nelsoniana
• Moss
  • Sphagnum spp.
  • Hylocomium splendens
  • Aulacomnium turgidum
  • Dicranum spp.
  • Polytrichum strictum
• Lichen
  • Cladina spp.
  • Cladonia amaurocraea
  • Cetraria spp.
  • Dactylina arctica

Community 54

Map Unit 55- cottongrass-water sedge (low-centered polygons) (Swanson and Schuman 1985) (Seward Peninsula).

• Sedge
  • Carex aquatilis
  • Eriophorum scheuchzeri
• Erect dwarf shrub
  • Ledum palustre ssp. decumbens
• Moss
  • Sphagnum spp.
• Lichen
  • Cladina spp.
  • Cladonia spp.