Kouyabouki - Kouyabouki

A deciduous shrub of the Asteraceae family (APG classification: Asteraceae). 0.5 to 1 meter tall. The stems are gray-brown, densely covered with fine short hairs, and well-branched. The leaves on the 1-year-old branches are ovate, alternate, and hairy, while the leaves on the 2-year-old branches are slender, and 3 to 4 leaves grow in clusters at the nodes. Flower heads bloom at the tips of the 1-year-old branches from September to October. The flowers are tubular and white, with five deeply lobed corollas and recurved lobes. The fruits are densely hairy and mature in October to November. They are widely distributed in Honshu, Shikoku, and Kyushu, from the southern part of the Tohoku region westward. Another species similar to this species is the long-leaved Koyabouki (P. glabrescens Sch.Bip.). This species has hairless branches and leaves, slightly slender leaves, and flowers on the 2-year-old branches, so it is distinguished from Koyabouki. They are found in Honshu, Shikoku, Kyushu, Tsushima, and Chugoku, west of Miyagi Prefecture. Both species are used to make brooms from their branches, which are mainly used in sake brewing. The name comes from the fact that brooms are made from these branches in Mount Koya.

[Yayoi Hayashi February 18, 2022]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

キク科（APG分類：キク科）の落葉低木。高さ0.5～1メートル。茎は灰褐色、細い短毛が密生し、よく分枝する。1年枝につく葉は卵形で互生し、毛が多く、2年枝につく葉は細長く、節から3、4枚が叢生(そうせい)する。9～10月、1年枝の先端に頭状花を開く。花は管状花で白色、花冠は5深裂し、裂片は反り返る。果実には毛が密生し、10～11月に成熟する。東北地方南部以西の本州、四国、九州に広く分布する。本種に類似した別種にナガバノコウヤボウキP. glabrescens Sch.Bip.がある。これは枝葉が無毛で、葉はやや細長く、2年枝に花がつくのでコウヤボウキとは区別される。宮城県以西の本州、四国、九州、対馬(つしま)、および中国に分布する。両種とも枝で箒(ほうき)をつくり、主として酒造りの際に使う。名は、高野山でこの枝から箒をつくるということに由来する。

［林　弥栄　2022年2月18日］

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