var. hydrophilum, a variety of thistle which is a federally listed endangered species. The Suisun thistle is perennial and stays in its juvenile stages of life until it is ready to flower and once the rosette reaches its mature phase it can take up to a year or more to develop the leafy stem. See also Suisun Bay Rich Island Duck Club Notes References External links Solano Land Trust Rush Ranch Suisun Marsh Program, California Department of Water Resources Suisun Marsh Salinity Control Gates (C.W.E.M.F.) Suisun Marsh Natural History Association Wetlands of the San Francisco Bay Area Landforms of Solano County, California San Francisco Bay Marshes of California