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"Hashika-gusa" (Hedyotis lindleyana var. hirsuta) belongs to Rubiaceae (the Madder family). It is an annual herb that is distributed from Honshu to Shikoku and Kyushu in Japan, as well as China and Southeast Asia. It grows on the roadsides of mountains and crawls on the ground. The roots are taken out from the nodes of the stem, and the tip is slanted. The leaves are ovate to narrow-ovate and opposite, with sparse vellus hair. From August to September, small white flowers come on the stem apex and axils. The corolla is tubular and the tip is split into four. The Japanese name is that when the leaves dry, they turn reddish brown and look like a measles rash.
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