Onirurisou - Onirurisou

A biennial plant of the family Boraginaceae (APG classification: Boraginaceae). The stem is 40-80 cm tall. It has coarse, pubescent hairs all over. The leaves are opposite, oblong-lanceolate, and sharply pointed at both ends. From June to August, the racemes grow long and produce small, pale bluish-purple flowers with five petals. It grows on gravel and riverbeds in hilly and mountainous areas, and is found in Hokkaido, Honshu, Shikoku, Kyushu, and Korea. The species with dense, downward-pointing short hairs on the lower part of the stem is called C. furcatum Wall. ( C. zeylanicum (Vhal) Thunb.). The C. genus has four segments with hook-shaped hairs all over the surface and a flat or protruding dorsum. There are about 90 species in the world, of which three are in Japan.

[Hideo Takahashi July 16, 2021]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

ムラサキ科（APG分類：ムラサキ科）の越年草。茎は高さ40～80センチメートル。全体に粗い開出毛がある。葉は対生し、長楕円(ちょうだえん)状披針(ひしん)形で、両端は鋭くとがる。6～8月、総状の花序を長く伸ばし、淡青紫色の小さな5弁花を開く。丘陵帯や山地帯の礫地(れきち)や川原に生え、北海道、本州、四国、九州、朝鮮に分布する。茎の下方に下向きの短毛が密生するものをオオルリソウC. furcatum Wall.（C. zeylanicum (Vhal) Thunb.）という。オオルリソウ属は4個の分果が全面に鉤(かぎ)状毛をもち、背面は平らまたは突出する。世界に約90種、そのうち日本に3種ある。

［高橋秀男　2021年7月16日］

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