水杉
"Metasequoia glyptostroboides" leaves are opposite, long, and bright fresh green, turning a foxy reddish brown in fall. The pollen cones are long, produced on long spikes in early spring; they are produced only on trees growing in regions with hot summers. The cones are globose to ovoid, in diameter with 16-28 scales arranged in opposite pairs in four rows, each pair at right angles to the adjacent pair; they mature in about 8–9 months after pollination.