The distribution of vascular plants in Ulleungdo Island and nearby islands (Gwaneumdo and Jukdo) located in Ulleung-gun area, Gyeongsangbuk-do. On-site investigation was conducted twice on June and September, 2012, investigating total 99 families, 304 genera and 508 taxa. This study also arranged already-secured specimens of the Korea National Arboretum (KH) (1917-2011), organizing 106 families, 362 genera and 646 taxa. As a result, total 108 families, 375 genera and 685 taxa of vascular plants were organized in the investigation area. In detail, this study confirmed 30 taxa of endemic plants including Sambucus sieboldiana var. pendula, Silene takeshimensis, and Corydalis filistipes, 41 taxa of rare plants including Arisaema takesimense, Dendranthema zawadskii var. lucidum, and Tripterospermum japonicum, 4 taxa of special plants of forest protection designated by the Korea Forest Service including Abelia coreana var. insularis, Fagus engleriana. Besides, specific plants designated by the Ministry of Environment were 121 taxa, and naturalized plants were 89 taxa.
