Ito, T., Nakamura, K., Park, C.-H., Song, G.-P., Maeda, A., Watanabe, Y. & Kokubugata, G. (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): 221–230. https://doi.org/10.11646/phytotaxa.177.4.3