Ito, Takuro, Koh Nakamura, Chan-Ho Park, Gwan-Pil Song, Ayako Maeda, Yuki Watanabe, and Goro Kokubugata. 2014. “Nuclear and Plastid DNA Data Confirm That Sedum tosaense (Crassulaceae) Has a Disjunct Distribution Between Pacific Mainland Japan and Jeju Island, Korea”. Phytotaxa 177 (4). Auckland, New Zealand:221–230. https://doi.org/10.11646/phytotaxa.177.4.3.