Giant Sequoia, Sequoiadendron giganteum, Tree Seeds. Giant Sequoia was originally discovered in 1833 by Zenas Leonard. Sequoiadendron giganteum and its close relative, Sequoia sempervirens (redwood), are jointly designated as the State Tree of California.Sequoiadendron, likeSequoia, is a monotypic genus in the bald cypress family, an ancient group of conifers that once shared the landscape with dinosaurs.
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