|Tree in Osaka-fu, Japan|
| Chamaecyparis obtusa|
(Siebold & Zucc.) Endl.
Chamaecyparis obtusa var. formosana
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.
Spreading and uses
The plant is spread in Japan. 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.
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.
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.
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:
- Crippsii makes a broad conic golden-green crown with a vigorous leading shoot, growing to 15–20 m or more tall.
- Flabelliformis is a dwarf growing with pale green leaves.
- Kosteri is a dwarf with brilliant green foliage.
- Lycopodioides reaches up to 19 m tall, with somewhat fasciated foliage.
- Minima under 10 cm after 20 years with mid-green foliage.
- Nana Aurea has golden tips to the fans and a bronze tone in winter.
- Nana Gracilis has crowded fans of tiny branches producing richly textured effects; it is often cited as a dwarf but has reached 11 m tall in cultivation in Britain.
- Nana Lutea A compact, slow-growing, golden yellow selection which has become very popular. A yellow counterpart to 'Nana gracilis'.
- Spiralis is an erect, stiff dwarf tree.
- Tempelhof which grows to 2–4 metres has a green-yellow foliage that turns bronze in winter.
- Tetragona Aurea grows to around 18 m tall, with a narrow crown and irregular branching, the scale leaves in 4 equal ranks and branchlets tightly crowded, green and gold.
The lignans chamaecypanones A and B, obtulignolide and isootobanone can be found in the heartwood of Chamaecyparis obtusa var. formosana. The biflavones sciadopitysin, ginkgetin, isoginkgetin, podocarpusflavone B, 7,7"-O-dimethylamentoflavone, bilobetin, podocarpusflavone A, 7-O-methylamentoflavone, amentoflavone and hinokiflavone have been confirmed in the leaves of the plant.
- Chamaecyparis obtusa 'Nana Gracilis'
- Japanese cypress, hinoki
- Hinoki cypress, Tanzawa Mountains, Japan
- Conifer Specialist Group (2000). "Chamaecyparis obtusa". IUCN Red List of Threatened Species. Version 2006. International Union for Conservation of Nature. Retrieved 11 May 2006.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
- Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Kew: Royal Botanic Gardens. ISBN 1-84246-068-4.
- Rushforth, K. (1987). Conifers. Helm. ISBN 0-7470-2801-X.
- Lewis, J. (1992). The International Conifer Register Part 3: The Cypresses. London: Royal Horticultural Society.
- Welch, H.; Haddow, G. (1993). The World Checklist of Conifers. Landsman's. ISBN 0-900513-09-8.
- Tree Register of the British Isles
- Kuo, Y.-H.; Chen, C.-H.; Chiang Y.-M. (September 2001). "Three novel and one new lignan, chamaecypanones A, B, obtulignolide and isootobanone from the heartwood of Chamaecyparis obtusa var. formosana". Tetrahedron Lett. 42 (38): 6731–6735. doi:10.1016/S0040-4039(01)01272-2.
- Krauze-Baranowska, M.; Pobłocka, L.; El-Hela, A. A. (September–October 2005). "Biflavones from Chamaecyparis obtusa". Z. Naturforsch. C. 60 (9–10): 679–685. PMID 16320608.
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