*PF06F, PF02F, PF02G  The swamp communities of Illinois are the
northernmost remnant  of vast network that once covered much of
the southern United States. Many  plant and animal species that
occur here are at the northernmost edge of their range.  The
characteristics of this community are the presence of permanent
to semipermanent water, and a greater than 30 % areal canopy
cover of tall (over 20 feet) woody vegetation.  In many areas,
the canopy cover exceeds 80%. The dominant trees include bald
cypress, some more than 1,000 years old, with knees up to 10
feet high.  These trees typically occur as scattered
individuals, or in small groves.  The classification code PF06F
represents a mixed class and is only used in areas where broad-
leaved and needle-leaved deciduous trees cannot be distinguished
on aerial photography; for example, where bald cypress and water
tupelo trees are growing together in  approximately equal
numbers.  The soils in this community consist of silt and clayey
materals. They range in rea