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with non-native and native annual grassland. These areas of mixed ?rasslands and woodlands contain important habitat for both woodland and wassland animals. including insect species. !\lost mixed ecosystems found in Pleasanton tend to be oak savannah. In contrast to a woodland which has a closed canopy a savanna canopy ranges from about 10 to 50 percent. Sycamore trees also grow within some savannah areas in Pleasanton. although sycamores tend to be more abundant in riparian woodland arcas. Wetland. '!1,ese arc found in and alon? the edges of lakes Oacustrine).' arroyos and canals (riparian) " as well as springs and other ephemeral water sources. Wetlands arc tllOse areas that arc inundated by water at a fretluency and duration sufficient to support vegetation typically adapted for life in saturated soil conditions. Wetlands venerally include swamps marshes bogs. and similar areas. Typical wetland vegetation in the Planning Area in eludes annual emergent species such as cattails sedges. watercress. tules and curly dock. Other species include rabbit's foot grass and water smartweed. \'(/etlands provide habitat for a number of wild creatures. inclutling waterfowl and amphibians. such as salamanders. Fi?ure VII-1. above identifies lakes and lacustrine areas and also riparian corridors. Riparian Corridor. Some. but not all. wetlands arc also riparian areas. Riparian vegetation grows along streams. arroyos. and drainage ditches. Riparian woodlands dominate some watercourses and include willows. white alders. big-leaf maples. and sycamores all tolerant of saturated soils. Valley oak. California bay laurel. black walnut. blaek cottonwood. and California buckeye trees also grow in Pleasanton's riparian areas. Below the riparian tree canopy arc shrubs such as poison oak. California blackberry. poison hemlock wild oats. ryegrass mulcfat. sedges. ferns. bromes. burr clover. stinging nettles. white swcctclovcr. wild radi:ih vetch and Inint. Other native species include California button-bush coyote brush. mug:wort elderberry. snowberry. and California rose. Riparian woodland is one of the most valuable native habitat types in California because it supports a diversity of wildlife species 111any of which arc rarc or uncommon. +he-Arroyo del Valle, Arroyo !\Iocho, Arroyo de la Laguna, and other nparian corridors in the Planning Area art: uOfllinatetl b) 0.11 th[[:itfH) of nat1.t: .egt:tat:iun cOll3i3ting of cotton....ood, .lycamorc, and ,...illow trcc3, and IUl ,1l~dt:ot.tH) of C;lliKHnia button I:n13h, t:B)Otc bru3h, tnug....ott, elderberry, "tlo"bertj, California m.le, "ilia" "l.rub.., eattail, ..1,,1 poi.It,)[1 0..1<. Non nllti,e jl'eeie.. itlc1ude I Iin.alayatl blaclrbelty llnd ttee tob..eeo.provide food, water, migration and dispersal corridors, breeding sites, and thermal cover for wildlife. A mixture of native and non-native plants grows in riparian, lacustrine (related to lakes), and other wetland areas. S Lacustrine means related to lakes. Lacustrine plants arc those Ih:1( grow or live on or at the edge of a lake. (, Riparian means related to watercourses such as streams. arroyos. and canals. Riparian plants are those that grow or live in or at lhe edge of a watercourse. r..on os Fkrrn:nt, CC 082906, m.llinc VII-7