Japanese Pagoda Tree (Styphnolobium japonicum) in Kew Gardens, London, (1765 – present, despite its name, the origin of the species is China).
Possibly the western botanist discovered it in Japan not knowing that an earlier botanist had already transported seeds from China to Japan.
I'm definitely growing senile. I was trying to remember what little I knew of East Asian history, when it struck me that I'd come across the expression "to shake the pagoda tree" many, many times. I even have a book of that name.
B. M. Croker.
The Pagoda Tree. London: Cassell, 1919.
In that usage, the pagoda tree represents untold riches, of the kind brought home to England by traders with India, Burma, and China. Mid- to late-18th century would be just about right. Come to think of it, if the Kew tree was brought to England as a sapling, it wouldn't have looked much like a pagoda. Maybe "Japanese Pagoda Tree" was some kind of botanical in-joke.