Glyptostrobus pensilis
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Glyptostrobus pensilis, known in Chinese as 水松 (Shuǐ sōng), and also Chinese swamp cypress, is an endangered conifer, and the sole living species in the genus Glyptostrobus.
Description
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It is a medium-sized to large tree, reaching Script error: No such module "convert". tall and with a trunk diameter of up to Script error: No such module "convert"., possibly more. The leaves are deciduous, spirally arranged but twisted at the base to lie in two horizontal ranks, Script error: No such module "convert". long and Script error: No such module "convert". broad, but Script error: No such module "convert". long and scale-like on shoots in the upper crown. The cones are green maturing yellow-brown, pear-shaped, Script error: No such module "convert". long and Script error: No such module "convert". diameter, broadest near the apex. They open when mature to release the small, Script error: No such module "convert". long, winged seeds. Like the related genus Taxodium, it produces 'cypress knees', or pneumatophores, when growing in water, thought to help transport oxygen to the roots.
Distribution and habitat
G. pensilis is native to subtropical southeastern China, from Fujian west to southeast Yunnan, and also very locally in Central Vietnam and down to central Laos, where stands exist in the Nakai-Nam Theun area.[1] It typically grows in river banks, ponds and swamps, growing in water up to Script error: No such module "convert". deep.
Conservation
The species is nearly extinct in the wild due to overcutting for its valuable decay-resistant, scented wood, but it is also fairly widely planted along the banks of rice paddies where its roots help to stabilise the banks by reducing soil erosion.[2] There appear to be no remaining wild plants in China and few of those in Vietnam are seed-bearing.[3] A population of Chinese swamp cypress was recently discovered in central Laos.[1] The species is found in several botanical gardens around the world.[4] It was previously reported that there were four specimens of this tree growing in Bank Hall Gardens, Lancashire, United Kingdom, but it has now been confirmed that they are in fact the swamp or bald cypress from the southeastern USA, Taxodium distichum.
Remarkable specimens
The largest known cultivated tree is located at the Christchurch Botanic gardens in New Zealand. The tree measures Template:Cvt tall, Template:Cvt wide and Template:Cvt in girth.[5]
Gallery
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Unripe cone
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Ripe cones
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Seedling in the Coastal Georgia Botanical Gardens, US
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Young tree in the Oregon Garden in autumn; it is deciduous
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Close-up of autumn foliage
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A wet environment
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400- to 500-year-old trees in Nanhua Temple
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Bark of trunk
References
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- ↑ a b McGuire, D. (28 May 2015). Saving the Endangered Chinese Swamp Cypress. Earth Island Journal. Retrieved 15 June 2019.
- ↑ Template:EFloras
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- ↑ Gymnosperm Database: Glyptostrobus. Retrieved 15 June 2019.
- ↑ Script error: No such module "citation/CS1".
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