Thuja gigantea Nuttall.

Trees to 50(-75) m tall; trunk to 2(-5) m d.b.h., often buttressed at base; bark reddish brown or grayish brown, fibrous, fissured; crown conical; branches arching; branchlets pendulous. Leaves on upper side of branchlets glossy green, (1-)3-6 mm, apex acuminate; lateral leaves longer than facial leaves, apex straight. Pollen cones reddish, 1-3 mm. Seed cones brown, ellipsoid, 1-1.4 cm; fertile cone scales 4-6. Seeds reddish-brown, 4-7.5 mm (including wings).

Cultivated. Jiangsu, Jiangxi [native to W Canada, NW United States]