Cirsium boninense explained

Cirsium boninense is a species of thistle in the family Asteraceae that is endemic to the Bonin Islands of Tōkyō Metropolis, Japan.^{[1] [2]}

Taxonomy

The species was first described by Japanese botanist Gen-ichi Koidzumi in 1914.^[1] The specific epithet relates to the type locality (Chichijima) in the Bonin Islands.^[1]

Description

Cirsium boninense is a perennial plant with white flowers from May to June that grows to a height of 40- among the grasses and rocks in coastal areas, as well as on the forest floor.^{[3] [4]}

Conservation status

Cirsium boninense is classed as Near Threatened on the Ministry of the Environment Red List.^{[5] [6]} According to the Red Data Book Tokyo, though decreasing on Chichijima, numbers are increasing on and Nakōdo-jima.^[3]

See also

• Cirsium toyoshimae

Notes and References

1. Plantae novae Japonicae II . la . . The Botanical Magazine . 0006-808X . 1914 . 28 . 331 . 171–173 [172].
2. Book: ja:日本の固有植物 . Endemic Plants of Japan . ja . Katō, M. .

   ja:加藤雅啓

   . Ebihara, A. .

   ja:海老原淳

   . March 2011 . . 978-4-486-01897-1 . 138, 258, 373.
3. Web site: https://tokyo-rdb.metro.tokyo.lg.jp/index.php . ja:オガサワラアザミ . Cirsium boninense . ja . . 7 May 2022.
4. Web site: https://www.kahaku.go.jp/research/db/botany/azami/detail.html?no=34 . ja:オガサワラアザミ . Cirsium boninense . ja . . 7 May 2022.
5. Web site: https://ikilog.biodic.go.jp/rdbdata/files/redlist2020/redlist2020_ikansoku.csv . ja:維管束植物 . Vascular Plants . ja . . 27 March 2020 . 7 May 2022.
6. Book: ja:レッドデータブック2014 —日本の絶滅のおそれのある野生生物— 8 植物I（維管束植物）. Red Data Book 2014 — Threatened Wildlife of Japan — Volume 8, Vascular Plants . ja . . Gyōsei Corporation . 2015 . 978-4-324-09902-5 . 613.