Three putative hybrids of the genus Hosta were found in Aichi and Gifu prefectures. H. longissima × H. kiyosumiensis was referred to H. alismifolia. Hosta longissima × H. sieboldii f. lancifolia was similar to H. × alismifolia, but differs from it in narrower leaves, fewer lateral veins of laminae, and rather distant flowers. Hosta kiyosumiensis × H. sieboldii f. lancifolia was very similar to H. undulata var. erromena.