Metasequoia glyptostroboides
Mainau Island is a "flowering island" notable for its parks and gardens. Frederick I, Grand Duke of Baden, created the island's arboretum, which now contains 500 species of deciduous and coniferous trees, many exotic and valuable, including fine specimens of "Sequoiadendron giganteum" (1864) and "Metasequoia glyptostroboides" (1952). The island also contains about 200 rhododendron and azalea varieties.