Picea koyamae
| Picea koyamae | |
|---|---|
| |
| Cultivated Specimen Morton Arboretum accession 126-65-1 | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Pinales |
| Family: | Pinaceae |
| Genus: | Picea |
| Species: | P. koyamae
|
| Binomial name | |
| Picea koyamae | |
Wikimedia Commons has media related to Picea koyamae.
Picea koyamae (Koyama's spruce;
ornamental tree
.
Description
It is a
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]
Distribution
Koyama's spruce is native to the
Honshū, Japan, where it grows at 1500–2000 m altitude.[2] It 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. Other threats include wildfires, landslides and changes in temperature and precipitation associated with climate change. There is little genetic exchange between different fragmentary locations where it grows, and the total area of occupation by this tree is less than 100 square kilometres (39 sq mi).[1][2]
The tree is named after the Japanese
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.
-
Recently dead specimen in the Arboretum de Chèvreloup, France -
Young shoot, Arboretum in Rogów, Poland -
Immature cones
References
- ^ . Retrieved 15 January 2018.
- ^ ISBN 3-87429-298-3.
- ^ Gymnosperm Database: Picea koyamae
- ISBN 1-900347-54-7.