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(First upload on June 6 2013. Last on February 20 2024) [ 日本語 | English ]

Sisyrinchium L. (ニワゼキショウ) Niwazekisyou (ニワゼキショウ, 庭石菖), annual blue eyed grass Life form: annual-perennial herb Distribution: exotic to Japan (including Hokkaido) Habitat: colonizing in grasslands, such as lawns

Flower color: diverse (white - pink - purple) Chromosome number: 2n = 32 Synonyms: Sisyrinchium atlanticum auct. non E. P. Bicknell Sisyrinchium angustifolium auct. non Mill.

Sisyrinchium rosulatum in Japan

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7 8 9
[1-3] at West Ariake Pier Park, Tokyo, on May 12 2013. [4-6] at the imperial gardens in the former lawn (Shiba) detached palace, Tokyo, on May 29 2015. [7] in Oi Pier Seaside Park, Tokyo, on June 3 2016. [8/9] on a lawn near the entrance of Mount Mihara on Izu-Oshima Island (伊豆大島) on June 7 2023.

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Sisyrinchium micranthum Cav. Oh-niwazekisyou (オオニワゼキショウ, 大庭石菖), blue pigroot or striped rush-leaf scientific name had not been assinged, due to the confusion - assigned

Lifeform: perennial herb Distribution: North America Habitat: disturbed sites, such as lawns and roadsides Assigned name: S. micranthum Cav.

Synonyms (as a result) Sisyrinchium sp. aff. iridifolium Kunth Sisyrinchium iridifolium Humb.Bonpl. et Kunth var. laxum Maekawa, incorrect

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[1/2] these plants flowered with Sisyrinchium rosulatum in the park on the same day.