Senegal tea plant; giant green hygro
An aquatic plant, Gymnocoronis spilanthoides, known as Senegal tea plant or giant green hygro. Usually written in katakana.
The Senegal tea plant is sometimes cultivated as an ornamental aquatic plant.
The Senegal tea plant is designated as an invasive alien species.
Katakana spelling is common for this plant name; usually written in kana.
Kanji spelling exists but is rarely used; the plant is normally written in kana.
From 水 (mizu, 'water') + 向日葵 (himawari, 'sunflower'), referring to its sunflower-like appearance and aquatic habitat.