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''Sequoia affinis'' is an extinct〔 Gregory, K.M, 1992. Late Eocene paleoelevation, paleoclimate, and paleogeography of the Front Range region, Colorado. PhD Thesis, University of Arizona, 246 p.〕 species of the genus ''Sequoia'' in the cypress family Cupressaceae (formerly treated in Taxodiaceae). The name Sequoia sometimes refers to the subfamily Sequoioideae, which includes the still-living ''S. sempervirens'' along with ''Sequoiadendron'' (giant sequoia) and ''Metasequoia'' (dawn redwood). On its own, the term redwood usually refers to the coast redwood, and not to the other genera. There are many ''Sequoia'' fossils found at the Florissant fossil beds in Florissant, Colorado, including ''Sequoia affinis''.〔 Meyer, Herbert W, 2003. The Fossils of Florissant. Smithsonian books, p. 84-87〕 Many branches of fossil ''Sequoia'' from Florissant have foliage with spreading leaves, which is also common in the modern ''Sequoia''. The leaves in the fossil species, however, are usually thinner and more delicate. An example of the leaves of ''Sequoia affinis'' has been featured on a postcard in a series on "Tertiary Fossil Plants," issued by the British Museum of Natural History in the early 1920s. It has also been suggested that ''Sequoia affinis'' may be ancestral to both ''Sequoia sempervirens'' and ''Sequoiadendron giganteum'' (Sierra redwood).〔 Typically the female cones of ''Sequoia affinis'' are only 50-70% of the length of modern redwood cones. This information, paired with other differences in the wood, foliage, and pollen, show the distinction between ''Sequoia affinis'' and ''Sequoia sempervirens''.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sequoia affinis」の詳細全文を読む スポンサード リンク
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