Endemic to the mountainous regions of northern Taiwan, Ailanthus altissima var. tanakae stands out as a unique high-altitude variant of the common tree of heaven. This deciduous tree populates dense montane forests, adapting to cooler temperatures and rocky terrains.
Botanists value this variety for its narrow ecological niche and localized distribution. It plays an important role in the biodiversity of Taiwanese mountain ecosystems, serving as a food source for local insects and stabilizing slopes.
This deciduous tree grows to moderate heights, featuring a relatively slender trunk compared to the lowland variety. The bark is smooth and grayish-brown, showing shallow fissures as the tree matures.
Its leaves are pinnately compound, arranged alternately along the twigs. The leaflets have margins that are mostly entire, distinguishing this taxon from the typical variety, which possesses distinct basal glandular teeth. The flowers are small, greenish-yellow, and arranged in terminal panicles.
The fruit consists of elongated samaras, which are dry, winged fruits containing a single seed. These wings allow the wind to disperse the seeds efficiently across mountainous terrain.
Flowers bloom from May to June, with fruits maturing in late autumn.
The primary value of this tree lies in its ecological contribution to forest conservation. It helps prevent soil erosion on steep mountain slopes through its robust root system.
Historically, the wood has been utilized locally for fuel and minor carpentry. Additionally, related taxa are used in traditional medicine, though this specific variety is rarely harvested due to its scarcity.
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