|Glyptostrobus sp. foliage, 49 mya, Washington, USA|
Glyptostrobus, is a small genus of conifers in the family Taxodiaceae closely related to Cupressaceae. The sole living species, Glyptostrobus pensilis, is native to subtropical southeastern China, from Fujian west to southeast Yunnan, and also very locally in northern Vietnam and Borikhamxai Province of eastern Lao PDR near the Vietnam border.
The genus formerly had a much wider range, covering most of the Northern Hemisphere, including the high Arctic in the Paleocene and Eocene. The oldest known fossils are late Cretaceous in age, found in North America. It contributed greatly to the coal swamps of the Cenozoic era. It was reduced to its current range before and during the Pleistocene ice ages.
G. pensilis is a medium-sized to large tree, reaching 30 m (98 ft) tall and with a trunk diameter of up to 1 m (3.3 ft), possibly more. The leaves are deciduous, spirally arranged but twisted at the base to lie in two horizontal ranks, 5–20 mm (0.20–0.79 in) long and 1–2 mm (0.039–0.079 in) broad, but 2–3 mm (0.079–0.118 in) long and scale-like on shoots in the upper crown. The cones are green maturing yellow-brown, pear-shaped, 2–3 cm (0.79–1.18 in) long and 1–1.5 cm (0.39–0.59 in) diameter, broadest near the apex. They open when mature to release the small, 5–20 mm (0.20–0.79 in) long, winged seeds.
It typically grows in river banks, ponds and swamps, growing in water up to 60 cm (24 in) deep. Like the related genus Taxodium, it produces 'cypress knees' when growing in water, thought to help transport oxygen to the roots.
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.
- "Cupressaceae Rich. ex Bartling 1830". The Gymnosperm Database. Retrieved 2009-10-14.
- "Glyptostrobus Endl.". Germplasm Resources Information Network. United States Department of Agriculture. 2007-07-17. Retrieved 2009-10-14.
- Nguyễn Đúc Tố Luu, Philip Ian Thomas, 2004. Conifers of Vietnam. 94 pp. Centre for Ecology & Hydrology, NERC, UK.
- Leonid V. Averyanov, Ke Loc Phan, Tien Hiep Nguyen, Sinh Khang Nguyen, Tien Vinh Nguyen and Thuy Duyen Pham, 2009. Preliminary Observation of Native Glyptostrobus pensilis (Taxodiaceae) Stands in Vietnam. Taiwania, 54(3): 191-212.
- LePage, B.A. 2007. The Taxonomy and Biogeographic History of Glyptostrobus. Bulletin of the Peabody Museum of Natural History, 48(2): 359-426. doi:10.3374/0079-032X(2007)48[359:TTABHO]2.0.CO;2
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