Abstract: Hordeum murinum subsp. leporinum (Link) Arcang., an invasive plant newly recorded in China, is described. A key for identifying the three subspecies of Hordeum murinum, including subsp. murinum, along with ink drawings and color photographs, is provided. Field surveys revealed that the plant spreads through vehicles, humans, and animals. The potential risk of its large-scale expansion warrants increased attention in China.