Eucommia (Eucommia ulmoides) is a small to . It is in the wild, but is widely cultivated in China for its , highly valued in such as (TCM). Eucommia is also occasionally planted in and other in , and elsewhere, being of interest as the only cold-tolerant (to at least -30°C) rubber-producing tree. of Eucommia have been found in 1035 million year old deposits in central and widely in (Call & Dilcher 1997), indicating that the genus had a much wider range in the past.