1917 Coolie Tu Chung Bark of Eucommia Ulmoides Tonic Medicine Yungyang Hsien China
Eucommia (Eucommia ulmoides) is a small tree native to China. It is near threatened in the wild, but is widely cultivated in China for its bark, and is highly valued in herbology such as Traditional Chinese medicine. Eucommia grows to about 15 m tall. The leaves are deciduous, arranged alternately, simple ovate with an acuminate tip, 8–16 cm long, and with a serrated margin. If a leaf is torn across, strands of latex exuded from the leaf veins solidify into rubber and hold the two parts of the leaf together. It flowers from March to May. The flowers are inconspicuous, small and greenish; the fruit, June to November, is a winged samara with one seed, very similar to an elm samara in appearance, 2–3 cm long and 1–2 cm broad Eucommia is the sole member of the family Eucommiaceae, and was formerly considered to be a separate order, the Eucommiales. It is also sometimes known as "Gutta-percha tree" or "Chinese rubber tree", but is not related to either the true Gutta-percha tree of southeastern Asia, nor to the South American rubber tree. Eucommia is also occasionally planted in botanical gardens and other gardens in Europe, North America and elsewhere, being of interest as the only cold-tolerant (to at least -30°C) rubber-producing tree. Fossils of Eucommia have been found in 10–35 million year old brown coal deposits in central Europe and widely in North America (Call & Dilcher 1997), indicating that the genus had a much wider range in the past.
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Photo credit: © SOTK2011 / Alamy / Afripics
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