- an endangered deciduous conifer, Metasequoia glyptostroboides, the shortest of the three extant species of subfamily Sequoioideae, reaching a height of 150 feet (45.7 meters): known only as widespread Mesozoic fossils until isolated living specimens were discovered in central China in the 1940s.
- a deciduous conifer, Metasequoia glyptostroboides, native to China but planted in other regions as an ornamental tree: family Taxodiaceae. Until the 1940s it was known only as a fossil
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