Branched horsetail (Equisetum ramosissimum) belongs to Equisetaceae (the Horsetail family). It is an evergreen fern that is distributed from Honshu to Shikoku and Kyushu of Japan, as well as the Korean Peninsula, China, southern Europe and Africa. This fern grows in sunny riverside, coastal marshes and can reach 60-100 cm in height. The rhizomes spread under grounds and the epigeal stems are erect. The stems are cylindrical 3-5 mm in diameter and branched on the nodes. The spore spikes are borne at the apex of shoot from April to July.