cotton grass; Eriophorum vaginatum subsp. fauriei
A plant with fluffy white seed heads resembling cotton, found in wetlands. The scientific name is Eriophorum vaginatum subsp. fauriei.
In early summer, you can see the white heads of cotton grass at Oze Marshland.
Katakana spelling is common for this plant name; usually written in kana.
Kanji form is rare; the plant is normally written in kana.
From 綿 (wata, 'cotton') + 菅 (suge, 'sedge'), referring to the cotton-like seed heads of this sedge species.