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(First upload on April 17 2004. Last on February 7 2014) [ 日本語 | English ]

Youngia Cass. (オニタビラコ) Yakushisou (ヤクシソウ, 薬師草) Life form: biennial forb < 1 m in height Distribution: China - Korea - Japan Habitat: sunny sites, such as roadsides and rocks → pioneer plant Stem: branching well Seed dispersal: wind Chromosome number: 2n = 10 Synonyms: Crepidiastrum denticulatum (Houtt.) J. H. Pak et Kawano Paraixeris denticulata (Houtt.) Nakai, often assigned f. pinnatipartita (Makino) Kitam. (ハナヤクシソウ), pinnatipartite

Synonyms: Crepidiastrum denticulatum (Houtt.) J. H. Pak et Kawano f. pinnatipartitum (Makino) Sennikov Paraixeris denticulata (Houtt.) Nakai f. pinnatipartita (Makino) Nakai f. pallescens (Momiy. et Tuyama) Kitam. (ウスイロヤクシソウ) Synonyms: Crepidiastrum denticulatum (Houtt.) J. H. Pak et Kawano f. pallescens (Momiy. et Tuyama) Yonek. Paraixeris denticulata (Houtt.) Nakai f. pallescens Momiy. et Tuyama

Youngia denticulata in Japan

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1 2 3
[1] on the northweastern slope of O-Usu that is the peak of Mount Usu in the summer of 1983 (Mount Usu, flora). [2/3] on a trail between the summit and Yakuo-in Shrine on Mount Takao (590 m elevation) in Mount Takao forest for recreational use (高尾山自然休養林), Tokyo, on October 21 2013. Records: at the bottom of Y-kun Crater in the Kompira Craters on Mount Usu on June 26 2021.