Thuja sutchuenensis

Taxobox
name = "Thuja sutchuenensis"
status = CR | status_system = IUCN3.1
trend = down


image_width = 240px
image_caption = Foliage and cones
regnum = Plantae
divisio = Pinophyta
classis = Pinopsida
ordo = Pinales
familia = Cupressaceae
genus = "Thuja"
species = "T. sutchuenensis"
binomial = "Thuja sutchuenensis"
binomial_authority = Franch.

"Thuja sutchuenensis" (Sichuan Thuja) is a species of thuja, an evergreen coniferous tree in the cypress family Cupressaceae. It is native to China, where it is a critically endangered local endemic in Chongqing Municipality in eastern Sichuan.

It is a small or medium-sized tree, reaching possibly 20 m tall, though no trees of this size are currently known. The foliage forms in flat sprays with scale-like leaves 1.5-4 mm long, green above, and with narrow white stomatal bands below. The cones are oval, green ripening brown, 5-8 mm long and 3-4.2 mm broad (opening to 7 mm broad), with 8-10 overlapping scales.

It was first described in 1899 from specimens collected by the French botanist Paul Guillaume Farges in 1892 and 1900, but was not seen again thereafter, despite many searches, for almost 100 years and was presumed to be extinct due to over-cutting for its valuable scented wood. A small number of specimens were however rediscovered in 1999, growing on very inaccessible steep ridges close to (or at the same site) where Farges had first found it. The area of its occurrence has now been designated a Special Protection Area in order to protect the species.

References and external links

* Database entry includes justification for why this species is critically endangered
* [http://www.conifers.org/cu/th/sutchuenensis.htm Gymnosperm Database: "Thuja sutchuenensis"]