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The Dwarf scouring rush (Equisetum scirpoides) belongs to Equisetaceae (the Horsetail family). It is an evergreen fern that is widely distributed from Hokkaido in Japan to the Kuril Islands, the northern part of the Korean Peninsula, northern China, Russia, Northern Europe, and northern North America. It grows in wetlands and is 10 to 20 cm tall. It spreads by rhizomes and the stems grow in clusters. The stem is cylindrical, about 5 mm in diameter, with fine furrows running vertically across its surface. The leaves are sheath-like and attached at the nodes. The 2-3 mm long sporangia are produced at the top of the stem from June to August. It is called "藺木賊" (lin mu zei) in Chinese.
In Korean, it's called "jom-sok-se" (좀속새) or "ae-gi-sok-se" (애기속새). This is a compound word consisting of "small" (jom: 좀) or "baby" (ae-gi: 애기) + "horsetail" (sok-se: 속새 ).
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