Abstract
<i>Saxifraga cortusifolia</i> Siebold & Zucc. (Saxifragaceae, sect. <i>Irregulares</i>, ser. <i>Rufescentes</i>), a species considered endemic along mountain streams throughout Honshu, Shikoku, and Kyushu in Japan, was discovered as a wild population in the Cheona Valley in Haean-dong, Jeju-si on Jeju-do Island of Korea. The population consisted of three subpopulations occupying narrow areas 10 × 10 m<sup>2</sup>, 5 × 5 m<sup>2</sup>, and 10 × 5 m<sup>2</sup> in size. The number of individuals in the three subpopulations was confirmed to exceed 100. Most of the individuals were on or below rocks at the edge of the valley. A morphological description, detailed photos, and a key to related taxa in Korea are presented.
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