It is distributed over East Asia including the whole land of Japan and the northeastern part of the United States.   There are approximately 180 kinds spiderwort genus in the world, and there are five kinds in Japan.
   The spiderwort is called "Tuyukusa".   It was called Tukikusa in old days.   It may be called "Hotarugusa" and "Boshibana" from the form of the characteristic flowers.
   It does not stand straight at 15-50cm, and the stems crawl on the ground.   It has a blue flower approximately 1,5-2cm over from June to September.   The flower which bloomed in the morning withers away in the afternoon.

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