<i>Saxifraga cortusifolia</i> (Saxifragaceae): A new record for the Korean flora from Jejudo Island

Abstract

&lt;i&gt;Saxifraga cortusifolia&lt;/i&gt; Siebold &amp; Zucc. (Saxifragaceae, sect. &lt;i&gt;Irregulares&lt;/i&gt;, ser. &lt;i&gt;Rufescentes&lt;/i&gt;), 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&lt;sup&gt;2&lt;/sup&gt;, 5 × 5 m&lt;sup&gt;2&lt;/sup&gt;, and 10 × 5 m&lt;sup&gt;2&lt;/sup&gt; 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.