dayflower
Refers to plants of the genus Commelina, especially Commelina communis, known as Asiatic dayflower. The name 蛍草 (firefly plant) may come from the brief blooming period or the shape of the flower.
Dayflowers were blooming by the roadside.
The name 蛍草 (firefly plant) is thought to derive from the flower's resemblance to a firefly or its brief blooming period, but the exact origin is uncertain.