noun
Asiatic dayflower; Commelina communis
A common annual plant with small blue flowers, often found in moist shady places. Also known as 露草 (つゆくさ).
See also: 露草
道端に青花が咲いていた。
Asiatic dayflowers were blooming by the roadside.
noun
dayflower blue dye
A traditional blue dye extracted from the petals of the Asiatic dayflower, used in painting and textiles.
浮世絵の青は青花から作られた。
The blue in ukiyo-e prints was made from dayflower blue dye.
露草 is a common synonym for the plant, often used in everyday contexts. 青花 can refer to both the plant and the dye, while 露草 is primarily the plant.
Compound of 青 (あお, 'blue') and 花 (はな, 'flower'), with rendaku voicing of はな to ばな. The name directly describes the plant's blue flowers.