A common annual weed with small blue flowers, native to East Asia. Scientific name: Commelina communis.
Asiatic dayflowers were blooming by the roadside.
Katakana spelling is common for this plant name; usually written in kana.
Kanji spelling is possible but less common; usually written in kana.
The name 露草 (dew plant) likely refers to the delicate flowers that open in the morning and wilt by midday, resembling dew. The exact historical derivation is uncertain.