On the remote shore of Negwegon State Park, where Lake Huron’s rugged coast gives way to long, narrow sand dunes, one of Michigan’s rarest plants is hanging on.For most of its life, the Pitcher’s thistle is a wispy tangle of short, silver-green stems.Below ground, the plant will spend the better part of a decade sending a taproot 6 feet down. … More Treasures in the Sand: Protecting One of Michigan’s Rarest Plants