Английская Википедия:Glyptostrobus pensilis

Содержание

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

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

It is a medium-sized to large tree, reaching Шаблон:Convert tall and with a trunk diameter of up to Шаблон:Convert, possibly more. The leaves are deciduous, spirally arranged but twisted at the base to lie in two horizontal ranks, Шаблон:Convert long and Шаблон:Convert broad, but Шаблон:Convert long and scale-like on shoots in the upper crown. The cones are green maturing yellow-brown, pear-shaped, Шаблон:Convert long and Шаблон:Convert diameter, broadest near the apex. They open when mature to release the small, Шаблон: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 northern Vietnam and down to central Laos, where stands exist in the Nakai-Nam Theun area. It typically grows in river banks, ponds and swamps, growing in water up to Шаблон: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. There appear to be no remaining wild plants in China and few of those in Vietnam are seed-bearing. A population of Chinese swamp cypress was recently discovered in central Laos. The species is found in several botanical gardens around the world. 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.

Gallery

• Unripe cone

  Unripe cone

• Ripe cones

  Ripe cones

• Seedling in the Coastal Georgia Botanical Gardens, US

  Seedling in the Coastal Georgia Botanical Gardens, US

• Young tree in the Oregon Garden in autumn; it is deciduous

  Young tree in the Oregon Garden in autumn; it is deciduous

• Close-up of autumn foliage

  Close-up of autumn foliage

• A wet environment

  A wet environment

• 400- to 500-year-old trees in Nanhua Temple

  400- to 500-year-old trees in Nanhua Temple

• Bark of trunk

  Bark of trunk

External links

• Arboretum de Villardebelle: photo of cone