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Picea koyamae
Also called Koyama Spruce
Picea koyamae (Koyama's spruce; Japanese: ヤツガタケトウヒ or やつがたけとうひ yatsugatake-touhi) is a rare spruce, endemic to the Akaishi Mountains and Yatsugatake Mountains in central Honshu, Japan. It is an evergreen tree growing to 25 m (82 ft) tall, with a trunk diameter of up to a metre. It grows in small isolated stands in a limited area and the total area of occupation is less than 100 square kilometres (39 sq mi). Trees that are lost to typhoons are normally replaced with other faster-growing species and the International Union for Conservation of Nature has assessed the tree as being "critically endangered". Some trees are in cultivation for their ornamentality.
Koyama's spruce is native to the Akaishi Mountains and Yatsugatake Mountains, or Nagano and Yamanashi Prefectures in central Honshū, Japan, where it grows at 1500–2000 m altitude. 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).
Norway Spruce · Interior spruce · Alcock's Spruce · Dragon Spruce · Orange Spruce · Picea austropanlanica · Sargent's Spruce · Brewer's Spruce · Chihuahua Spruce · Qinghai Spruce · Engelmann Spruce · Farrer spruce
Text excerpted from the Wikipedia article Picea koyamae by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
