Locations of other problem species have also been documented. A county-wide electronic map of Japanese knotweed, Phragmites, teasel, and wild parsnip infested locations is updated annually. In 2019, 25 miles of roadsides were surveyed for invasive species, and in 2020, 62 miles of streams were surveyed for invasive species. The Grand Traverse islands have some of Wisconsin's richest rare plant reserves. Rare plants Īlong with nearby Marinette and Delta (see Garden Peninsula) counties, Door County is home to endemic plants and disjunct populations, such as those protected at Plum Island, Coffee Swamp, Cave Point County Park, the adjacent Whitefish Dunes State Park, and The Ridges Sanctuary. In 2017, 9 species of aquatic plants were found in the Forestville Millpond, also called the Forestville Dam or Forestville Flowage. In 2006, 60 species of aquatic plants or macrophytic algae were found in Clark Lake and nearby upstream, including spotted pondweed, Potamogeton pulcher, which is endangered in Wisconsin. In particular, Washington Island is one of only two places in Wisconsin where the fern Asplenium viride (green spleenwort) is found. Snake Island had 156 species, Cana Island had 111, Hat Island 22, Chambers Island 398, Adventure Island 58, Little Strawberry Island 44, Jack Island 28, Horseshoe Island 49, Sister Island 6, Spider Island 42, Plum Island 259, Detroit Island 25, Pilot Island 40, Washington Island 626, Hog Island 34, Rock Island 333, and Gravel and Fish islands were devoid of plant life. In 2001, species lists were compiled for the county's islands. 255 unique taxa of mosses, liverworts, and hornworts have been identified in Door County. 5 Vegetation along the Green Bay and Lake Michigan shoresĪs of 2019, 1201 species and hybrids of vascular plants have been identified in the county, including the yellow lady's-slipper Cypripedium parviflorum, the official county flower.
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