Alder trees belong to the birch family.

赤杨属于桦木科.

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The microorganisms involved in symbiosis with the alder tree are actinomycetes of the genus Frankia.

而与赤杨共生的微生物是放线菌.

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The weeping - willow , the weeping - birch , and other trees of early and pendulous shoots, flourish favoured recesses.

这些幽静去处得天独厚,垂柳, 赤杨及其他抽枝发芽较早的树木长得非常茂盛.

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The tiniest unfurling of pale green at the tips of the alder trees'branches.

赤杨树的树梢泛着隐隐约约的绿.

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