''Thuja sutchuenensis'', the Sichuan thuja, is a species of ''
Thuja'', an
evergreen conifer
Conifers are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single ...
ous
tree in the cypress family
Cupressaceae
Cupressaceae is a conifer family, the cypress family, with worldwide distribution. The family includes 27–30 genera (17 monotypic), which include the junipers and redwoods, with about 130–140 species in total. They are monoecious, subdio ...
.
[ It is native to ]China
China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
, where it is an endangered local endemic in Chengkou County (Chongqing
Chongqing ( or ; ; Sichuanese dialects, Sichuanese pronunciation: , Standard Mandarin pronunciation: ), Postal Romanization, alternately romanized as Chungking (), is a Direct-administered municipalities of China, municipality in Southwes ...
Municipality, formerly part of Sichuan province), on the southern slope of the Daba Mountains.
Description
It is a small or medium-sized tree, reaching possibly 20 m tall,leaves
A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...
1.5–4 mm long, green above, and with narrow white stoma
In botany, a stoma (from Greek ''στόμα'', "mouth", plural "stomata"), also called a stomate (plural "stomates"), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange. The pore is bor ...
tal 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.[
]
Discovery and rediscovery
It was first described in 1899 from specimens collected by the French
French (french: français(e), link=no) may refer to:
* Something of, from, or related to France
** French language, which originated in France, and its various dialects and accents
** French people, a nation and ethnic group identified with Franc ...
botanist
Botany, also called , plant biology or phytology, is the science of plant life and a branch of biology. A botanist, plant scientist or phytologist is a scientist who specialises in this field. The term "botany" comes from the Ancient Greek wo ...
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
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
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
External links
*
{{Taxonbar, from=Q1969504
sutchuenensis
Endemic flora of China
Flora of Sichuan
Trees of China
Endangered flora of Asia