|Don's Home Places California Redwoods|
About 40 species of sequoias existed in the Northern Hemisphere some 60 million years ago. Only two species survived.|
Both exist principally in California; both have a high resistance to fire, insects and disease, which accounts largely for their age.
Some redwoods are at least 1,000 years old. The oldest known Giant Sequoia based on ring count is 3,500 years old. Most mature trees are 500 to 800 years old.
Conifer (Coniferales ) Order Cypress (Cupressaceae) Family Giant Sequoia (Sequoiadendron) Genus Giant Sequoia (Sequoiadendron Giganteum) Species Redwood (Sequoia) Genus Redwood (Sequoia Sempervirens) SpeciesNote: Genetic analysis in the early 1990's has caused microbotonists [a term I just made up] to merge the Taxodiaceae family (Redwood/Bald Cypress) into the Cupressaceae (Cypress) family.
See: Phylogenetic relationships in Taxodiaceae and Cupressaceae sensu stricto based on matK gene, chlL gene, trnL-trnF IGS region, and trnL intron sequences -- Kusumi et al. 87 (10): 1480 -- American Journal of Botany, 1999
The bald cypress (Taxodium distichum) and dawn redwood (Metasequoia glyptostroboides) are closely related to Sequoia.
Sequoiadendron Giganteum (Big Trees, Giant Sequoia)
Sequoia Sempervirens (Coast Redwoods)
Japanese Cedars (Cryptomeria japonica), introduced into the US, has foliage resembling the Giant Sequoia.
Incense Cedar (Libocedrus decurrens) has bark similar to Sequoias.
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