Abstract
Circumscription of three sections of Hemerocallis that were recognized by Matsuoka & Hotta (Acta Phytotax. Geobot. 22: 25–43, 1966) and Hotta (Fl. Jap. IVb: 130–134, 2016) was evaluated through MIG-seq analysis of 45 samples of seven species and nine varieties of Hemerocallis, covering all taxa native to Japan except H. fulva vars. aurantiaca and pauciflora. The Neighbor-Net network of the MIG-seq data yielded three major clusters corresponding to the three sections of Hemerocallis recognized by Matsuoka & Hotta (1966) and Hotta (2016), except that H. hakuunensis and H. major, which were included in H. sect. Fulvae by Matsuoka & Hotta (1966) and Hotta (2016), were embedded in the cluster of H. sect. Hemerocallis. Hemerocallis hakuunensis and H. major usually have fragrant flowers and lack horizontally spreading rhizomes in the same manner as H. sect. Hemerocallis, which are not features of H. sect. Fulvae. We propose a transfer of H. hakuunensis and H. major from H. sect. Fulvae to H. sect. Hemerocallis. Hemerocallis minor appears to be conspecific with H. lilioasphodelus and is better regarded as H. lilioasphodelus var. minor. Hemerocallis lilioasphodelus var. thunbergii is placed in synonym under H. lilioasphodelus var. lilioasphodelus.
