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

Youngia denticulata (Houttuyn) Kitamura






Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

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

索引

Youngia denticulata in Japan


Youngia1 Youngia2 Youngia3
[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.

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