ヤクシソウは２年草。陽当たりの良い山野で群生しています。花言葉は「にぎやか」。花の少ない秋の終わりに明るい黄色の花を咲かせます。
Crepidiastrum denticulatum is a biennial plant. It grows in clusters in sunny fields and mountains. The flower language is “lively”. It blooms bright yellow flowers at the end of autumn when there are few flowers.
【仮名】ヤクシソウ
【和名】薬師草
【英名】Crepidiastrum denticulatum, Teeth Margin Crepidiastrum
【学名】Crepidiastrum denticulatum
【誕生】11/ 12
【開花】09, 10, 11月
【花色】Yellow
ヤクシソウ
ヤクシソウの概要
ヤクシソウはキク科アゼトウナ属の２年草です。日本では北海道から本州、四国、九州まで、国外では朝鮮半島から中国、台湾、インドネシア、インドまで分布。陽当たりの良い山野で群生しています。花言葉は「にぎやか」。花の少ない秋の終わりに明るい黄色の花々を咲かせます。
ヤクシソウの名前
ヤクシソウの名前の由来は、葉や花が薬師如来の光背に似ているから、薬草として皮膚の腫れものに用いられたから…など諸説あり、定まっていません。ラテン語の属名クレピデアストラムは「フタマタタンポポ属に似ている」、種小名デンティクラツムは「細歯のある」という意味。
ヤクシソウの姿形
ヤクシソウの茎は無毛で、下方が直立、上方が分枝。根生葉は柄の長い匙形、茎生葉は先端の尖ったヴァイオリン形で柄がなく、茎を抱いて互生します。花は上を向いて咲き、花被が舌状花のみ12～14枚。花後は下を向いて痩果を結び、白色の冠毛のついた黒色の種子を風に乗せます。
ヤクシソウの空似
ヤクシソウに花が似ている「鬼田平子」はキク科オニタビラコ属の越年草。茎に細かな毛が生え、羽状に裂けた複葉を放射状に広げます。「花苦菜」はキク科ニガナ属の多年草。「苦菜」の変種「白花苦菜」の黄花種です。花が初夏に咲き、花被が08～10枚と少なく、雄しべが黒褐色。
Crepidiastrum denticulatum
Crepidiastrum denticulatum is a biennial plant of the Asteraceae family. In Japan, it is distributed from Hokkaido to Honshu, Shikoku, and Kyushu, and overseas from the Korean Peninsula to China, Taiwan, Indonesia, and India. It grows in clusters in sunny fields and mountains. The flower language is “lively”. It blooms bright yellow flowers at the end of autumn when there are few flowers.
The Japanese name of Crepidiastrum denticulatum means “Buddha who heals people’s illnesses”. There are various theories about the origin of the Japanese name, such as that the shape of the leaves and flowers resembles the decoration on the back of the Buddha statue, or that it was used as a medicinal herb for skin swelling, but there is no consensus. The Latin genus name Crepidiastrum means “resembling Crepis”, and the specific name denticulatum means “fine-toothed”.
The stems of Crepidiastrum denticulatum are hairless, erect at the bottom, and branched at the top. The basal leaves are spoon-shaped with long stalks. The cauline leaves are violin-shaped with pointed tips, stalkless, and alternate around the stem. The flowers bloom facing upwards, with 12 to 14 ray flowers. After flowering, the flowers turn downwards to form an achene, and black seeds with white pappus are carried on the wind.
“Youngia japonica”, whose flowers are similar to Crepidiastrum denticulatum, is a biennial plant of the Asteraceae family. The stems are covered with fine hairs, and the compound leaves, which are pinnately lobed, spread out radially. “Ixeridium dentatum” is a perennial plant of the Asteraceae family. The flowers bloom in early summer, have only 8 to 10 perianth petals, and the stamens are black-brown.
