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"Izu-hahako" (Conyza japonica) belongs to Asteraceae (the Aster family). It is an annual or biennial herb that is native to westward from Kanto district of Honshu to Shikoku and Kyushu, as well as Taiwan, China, Malaysia, Thailand, India and Afghanistan. This herb grows on sunny cliffs, and it can reach 25-55 cm in height. The whole plant is covered with grayish-white soft hairs. The leaves are oblong with obtuse apexes and serrate margines. The several flower heads bloom at the top of stems from April to June. The Japanese common name is derived from it could be found easily in Izu region of Honshu in former days.
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