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)

W3.2 Wet acidic complex with dwarf-shrub tundra (lower parts of Y-K Delta)

Wet sedge, moss communities (comm. 56) in complex with ponds, and drier lichen, ericaceous dwarf-shrub vegetation (S1.2, comm. 48). Central portions of the Yukon-Kuskokwim Delta, Subzone E.

(See S1.2)

Plant Communities:

Community 48

Vegetation type dwarf birch-heath-lichens (Hanson 1953); Vegetation type birch dwarf-shrub tundra (Racine and Anderson 1979); Map Unit 32- mixed shrub tundra,44 - shrub lichen upland (Swanson and Schuman 1985); Releve C14 (Raynolds et al. 2002) (Seward Peninsula).

Map Unit M11(Tande and Jennings 1986); Map Unit 71, lowland moist low scrub (Jorgenson 2000) (Yukon-Kuskokwim Delta).

Erect dwarf shrub: Betula nana, Ledum decumbens, Empetrum nigrum, Loiseleuria procumbens, Vaccinium uliginosum;
Lichen: Cladina rangiferina, Cladina stygia, Stereocaulon tomentosum;
Moss: Sphagnum spp., Dicranum spp.

Community 56

Map Unit W10 (Tande and Jennings 1986) (Yukon-Kuskowkim Delta).

Graminoid: Carex aquatilis, Carex rariflora, Calamagrostis deschamsioides;
Hemiprostrate dwarf shrub: Empetrum nigrum;
Moss: Sphagnum spp.