| Rosa hirtula | |
|---|---|
| |
| At the Hakone Botanical Garden of Wetlands | |
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| Foliage | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Rosales |
| Family: | Rosaceae |
| Genus: | Rosa |
| Species: | R. hirtula |
| Binomial name | |
| Rosa hirtula (Regel) Nakai | |
| Synonyms | |
| |
Rosa hirtula, the sanshou-bara or Hakone rose, is a species of flowering plant in the family Rosaceae. It is found only in the vicinity of Mount Fuji and neighboring Mount Hakone in Japan, and is the town flower of Hakone.
The pale pink, single flowers can be as wide as 7.5 cm (3 in). Quite unusually for a rose, it can take on a tree-like growth form, and reach up to 6 m (20 ft) tall. It has 4-9 pairs of leaves, the leaflets are each 1 to 3 cm (0.4 to 1.2 in) long. It flowers between May and June.
The causal fungus of a rust disease of Rosa hirtula was thought to be a common species Phragmidium rosae-multiflorae. After a study in 2019, it was concluded that it was a species distinct from P. rosae-multiflorae; and a new name, Phragmidium satoanum, was proposed for it.
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Unripe hip
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Bark tends to peel
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Detail of petal venation and anthers
References
- "Rosa hirtula (Regel) Nakai | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 30 September 2023.
- Tsuyuzaki, Shiro (2021). "Rosa hirtula (Regel) Nakai". hokudai.ac.jp. Hokkaido University. Retrieved 6 August 2022.
Sanshoubara (サンショウバラ, 山椒薔薇)
- ^ "Rosa hirtula (S)". The Royal Horticultural Society. 2022. Retrieved 6 August 2022.
Synonyms; Rosa roxburghii var. hirtula ... 1 suppliers
- "Rosa hirtula (Regel) Nakai". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 6 August 2022.
- "Fuji-Hakone-Izu". Japan National Tourism Organization. Ministry of the Environment, Government of Japan. Retrieved 6 August 2022.
unique to the area ... sansho-bara
- Ohba, Hideaki (2016). "840. Rosa hirtula". Curtis's Botanical Magazine. 33 (3): 226–234. doi:10.1111/curt.12152.
- "Rosa roxburghii var. hirtula". treeflower.la.coocan.jp. Retrieved 15 February 2020.
- Ono, Yoshitaka Wahyuno (2019). "Phragmidium satoanum, a new rust pathogen of Rosa hirtula in Japan". Mycoscience. 60 (4): 237–245.
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