3rd photo shows smaller, finer size of dawn redwood leaves compared with coast redwood. This tree was identified on the trail map as a Dawn Redwood.
Chelsea Physic Garden, London
Bailey Arboretum is home to some of the first Dawn Redwoods planted in the US. The individual marked and photographed in this observation is the tallest on site, and likely tallest in the State, with an incredible growth rate in the >70 years since it was planted. Bailey has a sign pointing out the "largest" tree present, on one of the other lawns, which is really just a moderate specimen with a very large basal flare. I think the tall specimen is more impressive.
Metasequoia glyptostroboides, the dawn redwood, is a fast-growing, critically endangered coniferous tree, the sole living species of the genus Metasequoia, one of three species in the subfamily Sequoioideae. It is native to the Sichuan-Hubei region of China. Although shortest of the redwoods, it grows to at least 200 ft (61 m) in height.