Image: 30 3⁄8 x 45 3⁄8 in. (771 x 1154 mm.) Sheet: 36 7⁄8 x 51 7⁄8 in. (937 x 1320 mm.) ...

Thirty years ago, a group of scientists planted 4,200 seeds of the rare Pitcher’s thistle in the sandy dunes of the Great Lakes. Three decades later, the plants are thriving.