Keteleeria davidiana (zh: 铁坚油杉) is a coniferousevergreentree native to Taiwan and southeast China, in the provinces of Gansu, Guangxi, Guizhou, Hubei, Hunan, Shaanxi, Sichuan, and Yunnan. It also occurs in the very northern part of Vietnam. The tree is restricted to hills, mountains, and valleys at elevations of 200–1500 m. Generally, it grows in regions with a more continental climate than the other two Keteleeria species.
The tree reaches 40–50 m in height, developing an irregular oblate crown with large branches. The branchlets have a dense covering of stiff hairs. The bark is dull brown to dark gray-black, and is scaly or flaky. The leaves are needle-like, 2-6.4 cm long by 3.6-4.2 mm broad. They are flat, stiff, and dark shiny green. The cones are light brown, cylindrical, and stand erect on the branches. They are 8–20 cm long and 4–5 cm broad with a stalk 2.5-3.2 cm long. The winged oblong seeds, which mature in October or November, are 13 mm long with a glossy brown wing 12–19 mm long.
Three varieties of the species exist:
Keteleeria davidiana var. calcarea. Guangxi and Guizhou on calcareous mountains. First-year branchlets yellow. Apices of seed scales blunt and rounded. Winter buds globular.
Keteleeria davidiana var. davidiana. First-year branchlets yellow-gray or light-gray. Apices of seed scales narrowed. Winter buds ovoid.
Keteleeria davidiana var. formosana. Endemic on Taiwan, at 300–900 m. Dark leaf scars protruding noticeably on branches. Leaves 2–4 cm long.
The wood is soft and white yellow, and is used for construction, bridges, furniture, and wood fiber.
Referencesedit
^Yang, Y.; Luscombe, D (2013). "Keteleeria davidiana". IUCN Red List of Threatened Species. 2013: e.T42306A2971058. doi:10.2305/IUCN.UK.2013-1.RLTS.T42306A2971058.en. Retrieved 12 November 2021.
Luu, Nguyen Duc To; Philip Ian Thomas (2004). . ISBN1-872291-64-3. Archived from the original on 2007-05-19. Retrieved 2012-04-09.
External linksedit
Wikimedia Commons has media related to Keteleeria davidiana.
Flora of China
April 11, 2024
keteleeria, davidiana, 铁坚油杉, coniferous, evergreen, tree, native, taiwan, southeast, china, provinces, gansu, guangxi, guizhou, hubei, hunan, shaanxi, sichuan, yunnan, also, occurs, very, northern, part, vietnam, tree, restricted, hills, mountains, valleys, el. Keteleeria davidiana zh 铁坚油杉 is a coniferous evergreen tree native to Taiwan and southeast China in the provinces of Gansu Guangxi Guizhou Hubei Hunan Shaanxi Sichuan and Yunnan It also occurs in the very northern part of Vietnam The tree is restricted to hills mountains and valleys at elevations of 200 1500 m Generally it grows in regions with a more continental climate than the other two Keteleeria species Keteleeria davidianaYoung plant in Quarryhill Botanical GardenConservation statusLeast Concern IUCN 3 1 1 Scientific classificationKingdom PlantaeClade TracheophytesClade GymnospermaeDivision PinophytaClass PinopsidaOrder PinalesFamily PinaceaeGenus KeteleeriaSpecies K davidianaBinomial nameKeteleeria davidiana Bertrand BeissnerThe tree reaches 40 50 m in height developing an irregular oblate crown with large branches The branchlets have a dense covering of stiff hairs The bark is dull brown to dark gray black and is scaly or flaky The leaves are needle like 2 6 4 cm long by 3 6 4 2 mm broad They are flat stiff and dark shiny green The cones are light brown cylindrical and stand erect on the branches They are 8 20 cm long and 4 5 cm broad with a stalk 2 5 3 2 cm long The winged oblong seeds which mature in October or November are 13 mm long with a glossy brown wing 12 19 mm long Three varieties of the species exist Keteleeria davidiana var calcarea Guangxi and Guizhou on calcareous mountains First year branchlets yellow Apices of seed scales blunt and rounded Winter buds globular Keteleeria davidiana var davidiana First year branchlets yellow gray or light gray Apices of seed scales narrowed Winter buds ovoid Keteleeria davidiana var formosana Endemic on Taiwan at 300 900 m Dark leaf scars protruding noticeably on branches Leaves 2 4 cm long The wood is soft and white yellow and is used for construction bridges furniture and wood fiber References edit Yang Y Luscombe D 2013 Keteleeria davidiana IUCN Red List of Threatened Species 2013 e T42306A2971058 doi 10 2305 IUCN UK 2013 1 RLTS T42306A2971058 en Retrieved 12 November 2021 Luu Nguyen Duc To Philip Ian Thomas 2004 Conifers of Vietnam ISBN 1 872291 64 3 Archived from the original on 2007 05 19 Retrieved 2012 04 09 External links edit nbsp Wikimedia Commons has media related to Keteleeria davidiana Gymnosperm Database Flora of China Retrieved from https en wikipedia org w index php title Keteleeria davidiana amp oldid 1153352925, wikipedia, wiki, book, books, library,
