sequoia(n = noun.plant) redwood - either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae;
is a kind of cypress
is a member of cupressaceae, cypress family, family cupressaceae
has particulars: california redwood, coast redwood, sequoia sempervirens, big tree, giant sequoia, sequoia gigantea, sequoia wellingtonia, sequoiadendron giganteum, sierra redwood

   A genus of coniferous trees, consisting of two species, Sequoia Washingtoniana, syn. S. gigantea, the “big tree” of California, and S. sempervirens, the redwood, both of which attain an immense height. [1913 Webster]

sequoia, n. a Californian evergreen coniferous tree, Sequoia sempervirens, of very great height.

Etymology:
mod.L genus-name, f. Sequoiah, the name of a Cherokee

genus sequoia, giant sequoia, sequoia gigantea, sequoia national park, sequoia sempervirens, sequoia wellingtonia