Picea koyamae
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| Picea koyamae | ||||||||||||||
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 Cultivated Specimen
Morton Arboretum accession 126-65-1 |
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| Picea koyamae Shiras. |
Picea koyamae (Koyama's Spruce; Japanese: ヤツガタケトウヒ yatsugatake-tohhi) is a rare spruce, native to Akaishi Mountains and Mount Yatsugatake, or Nagano and Yamanashi Prefectures in central Honshū, Japan, where it grows at 1500-2000 m altitude.[2]
It is a monoecious evergreen tree growing to 25 m tall, with a trunk diameter of up to 1 m. The shoots are orange-brown, with scattered pubescence. The leaves are needle-like, 8-16 mm long, rhombic in cross-section, dark bluish-green with conspicuous stomatal lines. The cones are cylindric-conic, 4-9 cm long and 2 cm broad, maturing pale brown 5-7 months after pollination, and have stiff, smoothly rounded scales 6–18 mm long and 6-12 mm wide. Pollination takes place in late spring.[2][3]
The spruce is found growing in groups of 10-20, with a total population of only about 250 mature trees. The main cause of decline is the loss of natural regeneration after typhoons, with windblown trees being replaced by the planting of other faster-growing commercially valuable species.[2][1]
It is named after the Japanese botanist Mitsua Koyama. The name was first published as "koyamai", but this is an orthographical error to be corrected under the provisions of ICBN Article 60.[4]
It is occasionally planted as an ornamental tree. The wood is similar to that of other spruces, but the species is too rare to be of economic value.
[edit] References
- ^ a b Conifer Specialist Group (1998). Picea koyamae. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Listed as Endangered (EN D v2.3)
- ^ a b c Farjon, A. (1990). Pinaceae. Drawings and Descriptions of the Genera. Koeltz Scientific Books ISBN 3-87429-298-3.
- ^ Gymnosperm Database: Picea koyamai
- ^ Farjon, A. (1998). World Checklist and Bibliography of Conifers. Royal Botanic Gardens, Kew ISBN 1-900347-54-7.
 Recently dead specimen in the Arboretum de Chèvreloup, France |
