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| Plate 73.--Classification: SYSTEM Palustrine, CLASS Emergent Wetland, SUBCLASS Nonpersistent, DOMINANCE TYPE Nuphar luteum, WATER REGIME Semipermanently Flooded, WATER CHEMISTRY Fresh. The principal subordinate plant is common duckweed (Lemna minor). (Cass County, Michigan; May 1985; Photo by F. C. Golet) |
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| Plate 74.--Classification: SYSTEM Palustrine, CLASS Scrub-Shrub Wetland, SUBCLASS Broad-leaved Deciduous, WATER REGIME Seasonally Flooded, WATER CHEMISTRY Fresh-Acid, SOIL Organic. The dominant plants are willows (Salix spp.). Subordinate species include Sitka spruce (Picea sitchensis) and lodgepole pine (Pinus contorta). (Coos County, Oregon; May 1977; Photo by D. D. Peters) |
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| Plate 75.--Classification: SYSTEM Palustrine, CLASS Scrub-Shrub Wetland, SUBCLASS Broad-leaved Deciduous, DOMINANCE TYPE Betula nana, WATER REGIME Saturated, WATER CHEMISTRY Fresh, SOIL Mineral. Subordinate plants include cotton grass (Eriophorum vaginatum), peat moss (Sphagnum spp.), cloudberry (Rubus chamaemorus), mountain cranberry (Vaccinium vitisidaea), and narrowleaf Labrador tea (Ledum decumbens). Shrubs here are less than 20 cm (8 in) tall. This area of moist tundra is underlain by permafrost at a depth of 45 cm (18 in). (Vicinity of Toolik Lake, North Slope Borough, Alaska; July 1985; Photo by F. C. Golet) |
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| Plate 76.--Classification: SYSTEM Palustrine, CLASS Scrub-Shrub Wetland, SUBCLASS Broad-leaved Deciduous, DOMINANCE TYPE Alnus tenuifolia, WATER REGIME Temporarily Flooded, WATER CHEMISTRY Fresh, SOIL Mineral. Subordinate plants include feltleaf willow (Salix alaxensis) and balsam poplar (Populus balsamifera). Shrubs are nearly 6 m (20 ft) tall, the height that separates Scrub-Shrub from Forested Wetland. This site is flooded only for brief periods after snowmelt and during times of most rapid melting of nearby glaciers. (Tanana River, Fairbanks North Star Borough, Alaska; July 1985; Photo by F. C. Golet) |