noun
Senegal tea plant; giant green hygro
An aquatic plant, Gymnocoronis spilanthoides, known as Senegal tea plant or giant green hygro. Usually written in katakana.
ミズヒマワリは観賞用の水草として栽培されることがある。
The Senegal tea plant is sometimes cultivated as an ornamental aquatic plant.
ミズヒマワリは特定外来生物に指定されている。
The Senegal tea plant is designated as an invasive alien species.
From 水 (mizu, 'water') + 向日葵 (himawari, 'sunflower'), referring to its sunflower-like appearance and aquatic habitat.