Thuja koraiensis

Thuja koraiensis, also called Korean arborvitae,^[2] is a species of Thuja, native to Korea and the extreme northeast of China (Changbaishan). Its current status is poorly known; the small population in China is protected in the Changbaishan Nature Reserve, as is the small population in Soraksan Nature Reserve in northern South Korea, but most of the species' range in North Korea is unprotected and threatened by habitat loss.^[1][3]

Thuja koraiensis
Conservation status
Vulnerable  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnospermae
Division:	Pinophyta
Class:	Pinopsida
Order:	Cupressales
Family:	Cupressaceae
Genus:	Thuja
Species:	T. koraiensis
Binomial name
Thuja koraiensis Nakai

It is an evergreen shrub or small tree growing to 3–10 m tall. The foliage forms flat sprays with scale-like leaves 2–4 mm long (up to 15 mm long on strong-growing shoots), matt dark green above, and with broad, vivid white stomatal wax bands below. The cones are oval, yellow-green ripening red-brown, 7–11 mm long and 4–5 mm broad (opening to 6–9 mm broad), with 8-12 overlapping scales.^[3]

It is occasionally grown as an ornamental tree for the contrast between the green upper and bright white lower sides of the foliage, though planting is limited by the low availability of seeds.

References

1. Kim, Y.-S.; Chang, C.-S.; Lee, H.; Gardner, M. (2011). "Thuja koraiensis". IUCN Red List of Threatened Species. 2011: e.T31245A9619180. doi:10.2305/IUCN.UK.2011-2.RLTS.T31245A9619180.en. Retrieved 16 November 2021.
2. English Names for Korean Native Plants (PDF). Pocheon: Korea National Arboretum. 2015. p. 656. ISBN 978-89-97450-98-5. Archived from the original (PDF) on 25 May 2017. Retrieved 17 December 2016 – via Korea Forest Service.
3. Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4