Epilobium angustifolium, great willow herb

Japanese: ヤナギラン(柳蘭) - ヤナギラン（英語表記）Epilobium angustifolium; great willow herb

A perennial plant of the Onagraceae family, also known as willow grass. It is widely distributed in the cool temperate zone of the Northern Hemisphere. In Japan, it grows in clusters in sunny places such as grasslands on the plateaus of Hokkaido and the Chubu region and north. It particularly invades areas where vegetation has been destroyed, such as clearcuts and forest fires. The stems are unbranched and stand upright at a height of 1 to 1.5 meters. The leaves are alternate and lanceolate, somewhat large, and resemble willow leaves in both shape and texture. The underside is powdery white with very small sawtooth edges. In July and August, the racemes form a terminal inflorescence, and many beautiful red-purple flowers bloom. There are four sepals and petals, and eight long stamens. The ovary below the flower is linear and long, and when it ripens after flowering, it becomes a capsule. The seeds have long white hairs at the end.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

アカバナ科の多年草で，ヤナギソウともいう。北半球の冷温帯に広い分布をもつ。日本では北海道と中部以北の高原の草地など，日当りのよいところに群生する。特に伐開地や山火事の跡など植生の破壊されたところに侵入する。茎は分枝せず，高さ1～1.5mで直立する。葉は互生し披針形でやや大きく，形，質感ともにヤナギの葉に似ている。下面は粉白色で，縁にごく小さい鋸歯がある。7～8月に，総状花序を頂生し，紅紫色の花を多数つけて美しい。萼片，花弁ともに4枚あり，おしべは8本で長い。花の下につく子房は線形で長く，花後に熟すると蒴果となる。種子の先に長い白毛がある。

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