. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS. Natural wetland remaining () Figure 19. Percentage of presentment wetlands lost in each county by the 1980s. including cattails, arrowheads, and bulrushes, are amphibious; that is, they grow with their roots in wet soil for all or part of the year and send up leaves that stand erect above the surface of the water. Submerged plants like pondweeds are also rooted in the soil, but their s
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS. Natural wetland remaining () Figure 19. Percentage of presentment wetlands lost in each county by the 1980s. including cattails, arrowheads, and bulrushes, are amphibious; that is, they grow with their roots in wet soil for all or part of the year and send up leaves that stand erect above the surface of the water. Submerged plants like pondweeds are also rooted in the soil, but their stems and leaves remain entirely underwater. Other plant types that occupy the drier portions of wetlands include moist-soil plants (sedges), moist-soil shrubs (buttonbush and red osier dogwood), and moist-forest species (tamarack, bald cypress, and silver maple). Some wetlands contain all of these vegetation types, but others have only one or two. Along with water chemistry and hydrology, differences in vegeta- tion help to determine the presence of a wetland and also to distinguish among the various types of wetlands. Groups (Taxonomic and Habit) The species identified in this document as wetland plants are that part of the Illinois vascular flora recognized in the National List of Plant Species that Occur in Wetlands (Reed 1988) and include all species ranked FAC+ and wetter. Botanical nomenclature. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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