Vietnamese golden cypress (Xanthocyparis vietnamensis)
The Vietnamese golden cypress was only discovered in 1999 in Vietnam and one plant has also been found in China. There are only about 450 trees in the wild.
It was first brought over to the UK by the Royal Botanical Gardens Edinburgh and a Global Trees Campaign seed collecting expedition of 2008 gave Bedbebury Pinetum access to the seeds. The Pinetum is the only site to have grown the tree from seed so far and holds the only seedlings. The Pinetum is sharing the germinating knowhow with the Centre for Plant Conservation in Vietnam. Other trees have been propagated using cuttings to overcome the problem of seeds not being readily available.
Read here about the seed collection expedition of 2008.