<i>Cirsium reflexiphyllarium</i> (Asteraceae), a new species of Cirsium from Korea

<i>Cirsium reflexiphyllarium</i> is described as a new species from Mt. Hwaaksan and Mt. Myeongjisan in Gapyeong-gun, Gyeonggi-do, and Mt. Daeamsan in Yanggu-gun, Gangwon-do, Korea. This species has previously been misidentified as <i>C. schantarense</i>, <i>C. diamantiacum</i>, and <i>C. pendulum</i> owing to its nodding capitula and occurrence in high-elevation habitats, and it also resembles <i>C. pendulum</i> in having nodding capitula. It differs from <i>C. schantarense</i> in having a non-arachnoid abaxial leaf surface, bracteate capitula, reflexed, non-glutinous phyllaries, and a linear pappus apex; from <i>C. diamantiacum</i> in the relative lengths of the phyllaries, corolla, and pappus; and from <i>C. pendulum</i> in its semi-amplexicaul leaf base and the ratio of the corolla tube length to the corolla limb length. Based on this combination of morphological characters, this species is recognized as a distinct new species. The specific epithet <i>reflexiphyllarium</i> refers to the reflexed phyllaries. A description, illustrations, photographic plates, and an identification key are provided.