Thuja sutchuenensis

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Thuja sutchuenensis
Scientific classification Red Pencil Icon.png
Domain: Eukaryota
Kingdom: Plantae
Clade: Tracheophytes
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Cupressaceae
Genus: Thuja
Species:
T. sutchuenensis
Binomial name
Thuja sutchuenensis

Thuja sutchuenensis, the Sichuan thuja, is a species of Thuja , an evergreen coniferous tree in the cypress family Cupressaceae. [2] It is native to China, where it is an endangered local endemic in Chengkou County (Chongqing Municipality, formerly part of Sichuan province), on the southern slope of the Daba Mountains. [1] [3]

Contents

Description

It is a small or medium-sized tree, reaching possibly 20 m tall, [2] 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. [3]

Discovery and rediscovery

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. [1] The area of its occurrence has now been designated a Special Protection Area in order to protect the species.

Related Research Articles

<i>Thuja</i>

Thuja is a genus of coniferous trees in the Cupressaceae. There are five species in the genus, two native to North America and three native to eastern Asia. The genus is monophyletic and sister to Thujopsis. Members are commonly known as arborvitaes, thujas or cedars.

Cupressaceae The cypress family of conifers

Cupressaceae is a conifer family, the cypress family, with worldwide distribution. The family includes 27–30 genera, which include the junipers and redwoods, with about 130–140 species in total. They are monoecious, subdioecious or (rarely) dioecious trees and shrubs up to 116 m (381 ft) tall. The bark of mature trees is commonly orange- to red- brown and of stringy texture, often flaking or peeling in vertical strips, but smooth, scaly or hard and square-cracked in some species.

<i>Thuja occidentalis</i> Species of evergreen coniferous tree

Thuja occidentalis, also known as northern white cedar, eastern white cedar, or arborvitae, is an evergreen coniferous tree, in the cypress family Cupressaceae, which is native to eastern Canada and much of the northcentral and northeastern United States. It is widely cultivated as an ornamental plant.

<i>Platycladus</i>

Platycladus is a monotypic genus of evergreen coniferous tree in the cypress family Cupressaceae, containing only one species, Platycladus orientalis, also known as Chinese thuja, Oriental arborvitae, Chinese arborvitae, biota or Oriental thuja. It is native to northeastern parts of East Asia and North Asia, but is also now naturalised as an introduced species in other regions of the Asian continent.

<i>Calocedrus</i>

Calocedrus, the incense cedar, is a genus of coniferous trees in the cypress family Cupressaceae first described as a genus in 1873. It is native to eastern Asia and western North America. The generic name Calocedrus means "beautiful cedar".

<i>Taiwania</i>

Taiwania, with the single living species Taiwania cryptomerioides, is a large coniferous tree in the cypress family Cupressaceae.

<i>Cunninghamia</i>

Cunninghamia is a genus of one or two living species of evergreen coniferous trees in the cypress family Cupressaceae. They are native to China, northern Vietnam and Laos, and perhaps also Cambodia. They may reach 50 m (160 ft) in height. In vernacular use, it is most often known as Cunninghamia, but is also sometimes called "China-fir". The genus name Cunninghamia honours Dr. James Cunningham, a British doctor who introduced this species into cultivation in 1702 and botanist Allan Cunningham.

<i>Thuja standishii</i>

Thuja standishii is a species of thuja, an evergreen coniferous tree in the cypress family Cupressaceae. It is native to southern Japan, where it occurs on the islands of Honshū and Shikoku. It is a medium-sized tree, reaching 20–35 m tall and with a trunk up to 1 m diameter.

<i>Glyptostrobus pensilis</i>

Glyptostrobus pensilis, also known as Chinese swamp cypress, is the sole living species in the genus Glyptostrobus. It is native to subtropical southeastern China, from Fujian west to southeast Yunnan, and also very locally in northern Vietnam and Laos.

<i>Tetraclinis</i>

Tetraclinis is a genus of evergreen coniferous trees in the cypress family Cupressaceae, containing only one species, Tetraclinis articulata, also known as Thuja articulata, sandarac, sandarac tree or Barbary thuja, endemic to the western Mediterranean region. It is native to northwestern Africa in the Atlas Mountains of Morocco, Algeria, and Tunisia, with two small outlying populations on Malta, and near Cartagena in southeast Spain. It grows at relatively low altitudes in a hot, dry subtropical Mediterranean climate.

<i>Juniperus squamata</i> Species of Juniper

Juniperus squamata is a species of juniper native to the Himalayas and China, from northeastern Afghanistan east to western Yunnan in southwestern China, and with disjunct populations north to western Gansu and east to Fujian. It grows at 1,600-4,900 m altitude. It represents the provincial tree of Khyber Pakhtunkhwa (unofficial).

<i>Cupressus funebris</i>

Cupressus funebris, the Chinese weeping cypress, is a species of cypress native to southwestern and central China. It may also occur naturally in Vietnam.

<i>Juniperus foetidissima</i>

Juniperus foetidissima, with common names foetid juniper or stinking juniper, is a juniper tree species in the family Cupressaceae.

<i>Callitris columellaris</i>

Callitris columellaris is a species of coniferous tree in the family Cupressaceae, native to most of Australia. Common names include White Cypress-pine, Murray River Cypress-pine, and Northern Cypress-pine. Callitris columellaris has become naturalised in Hawaii and in southern Florida.

<i>Calocedrus formosana</i>

Calocedrus formosana is a conifer endemic to Taiwan.

<i>Calocedrus macrolepis</i>

Calocedrus macrolepis is a conifer native to southwest China, northern Vietnam, northern Laos, extreme northern Thailand and northeastern Myanmar.

<i>Abies fargesii</i>

Abies fargesii is a species of fir, a coniferous tree in the family Pinaceae. Its common name is Farges' fir, after the French missionary, botanist and plant collector, Paul Guillaume Farges. Abies fargesii can grow very large and be up to 40 metres (130 ft) tall. It is endemic to central China where it is found in Gansu, Henan, Hubei, Shaanxi, and Sichuan provinces. It grows in mountains and river basins at altitudes between 1,500–3,900 metres (4,900–12,800 ft) ASL. The cones of the given fir are 0.8 to 1.5 by 1.3–2 centimetres (0.51–0.79 in).

<i>Chamaecyparis formosensis</i>

Chamaecyparis formosensis is a species of Chamaecyparis, endemic to Taiwan, where it grows in the central mountains at moderate to high altitudes of 1000–2900 m. It is threatened by habitat loss and over-cutting for its valuable timber.

<i>Juniperus formosana</i>

Juniperus formosana, the Formosan juniper, is a species of conifer in the family Cupressaceae. It is a shrub or tree to 15 m (49 ft) tall, found in China and in Taiwan.

<i>Thuja koraiensis</i>

Thuja koraiensis, also called Korean arborvitae, 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.

References

  1. 1 2 3 Yang, Y.; Li, N.; Christian, T. & Luscombe, D (2013). "Thuja sutchuenensis". The IUCN Red List of Threatened Species . IUCN. 2013: e.T32378A2816862. doi:10.2305/IUCN.UK.2013-1.RLTS.T32378A2816862.en . Retrieved 11 January 2018.
  2. 1 2 Fu, Liguo; Yu, Yong-fu; Adams, Robert P.; Farjon, Aljos. "Thuja sutchuenensis". Flora of China. 4. Retrieved 2 May 2013 via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  3. 1 2 Xiang, Qiaoping; Fajon, Alan; Li, Zhenyu; Fu, Likuo; Liu, Zhengyu (2002). "Thuja sutchuenensis: A rediscovered species of the Cupressaceae" (PDF). Botanical Journal of the Linnean Society. 139 (3): 305–310. doi:10.1046/j.1095-8339.2002.00055.x.