Chamaecyparis obtusa

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Chamaecyparis obtusa
Tree in Osaka-fu, Japan
Conservation status
Scientific classification
Kingdom: Plantae
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Cupressaceae
Genus: Chamaecyparis
Species: C. obtusa
Binomial name
Chamaecyparis obtusa
(Siebold & Zucc.) Endl.

Chamaecyparis obtusa (Japanese cypress, hinoki cypress or hinoki; Japanese: 檜 or 桧, hinoki) is a species of cypress native to central Japan.[2][3]

Foliage; underside showing white stomatal lines

It is a slow-growing tree which grows to 35 m tall with a trunk up to 1 m in diameter. The bark is dark red-brown. The leaves are scale-like, 2-4 mm long, blunt tipped (obtuse), green above, and green below with a white stomatal band at the base of each scale-leaf. The cones are globose, 8-12 mm diameter, with 8-12 scales arranged in opposite pairs. The related Chamaecyparis pisifera (Sawara Cypress) can be readily distinguished in its having pointed tips to the leaves and smaller cones.[2][3]

A similar cypress found on Taiwan is treated by different botanists as either a variety of this species (as Chamaecyparis obtusa var. formosana) or as a separate species Chamaecyparis taiwanensis; it differs in having smaller cones (6-9 mm diameter) with smaller scales, and leaves with a more acute apex.[2][3]

[edit] Cultivation and uses

It is grown for its very high quality timber in Japan, where it is used as a material for building palaces, temples, shrines, traditional noh theatres, baths, table tennis blades and masu. The wood is lemon-scented, light pinkish-brown, with a rich, straight grain, and is highly rot-resistant.

For example, Horyuji Temple and Osaka Castle are built from Hinoki wood. The hinoki grown in Kiso, used for building Ise Shrine, are called 御神木 Go-Shin-boku "Tree where god stayed".

It is also a popular ornamental tree in parks and gardens, both in Japan and elsewhere in temperate climates, including western Europe and parts of North America. A large number of cultivars have been selected for garden planting, including dwarf forms, forms with yellow leaves, and forms with congested foliage. It is also often grown as bonsai.

Hinoki (and sugi) pollen is a major cause of hay fever in Japan.

[edit] Cultivars

Over 200 cultivars have been selected, varying in size from trees as large as the wild species, down to very slow-growing dwarf plants under 30 cm high. A few of the best known are:[4][5][6]

[edit] References

  1. ^ Conifer Specialist Group (2000). Chamaecyparis obtusa. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006.
  2. ^ a b c Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4
  3. ^ a b c Rushforth, K. (1987). Conifers. Helm ISBN 0-7470-2801-X.
  4. ^ Lewis, J. (1992). The International Conifer Register Part 3: The Cypresses. Royal Horticultural Society. London.
  5. ^ Welch, H., & Haddow, G. (1993). The World Checklist of Conifers. Landsman's. ISBN 0-900513-09-8.
  6. ^ Tree Register of the British Isles
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