| Family | Hemerocallidaceae (also placed in Liliaceae) |
| Scientific name | Hemerocallis middendorffii Trautvetter & C. A. Meyer var. musashiensis Hiyama |
| Synonyms | Hemerocallis middendorffii Trautvetter & C. A. Meyer var. esculenta (Koizumi) Ohwi forma musashiensis Hiyama |
| Common name | (Japanese common name) musashino kisuge (ムサシノキスゲ, 武蔵野黄萓 [meaning: Musashino yellow day-lily (Musashino = an old name of Kanto region)]) |
| (English common name) none | |
| Distribution | (Japan) Honshu (only western area of Tokyo City) |
| (Other nations) none | |
| Habitat | Lowland forest edge |
| Chromosomal number | unknown |
| Description | Leaves ca. 60-90cm long, ca. 10-20mm wide. Scapes electing 60-120cm tall. Flowers yellow perianths ca. 7cm, flowering in May (mainly in mid May). Perennial plants. |
| Reference | Hemerocallis middendorffii Trautv. & C. A. Mey. |
| May 2008 at Tsukuba Botanical Garden |
May 2008 at Tsukuba Botanical Garden |
May 2008 at Tsukuba Botanical Garden |
| July 2008 at Tsukuba Botanical Garden |
| early March 2009 at Tsukuba Botanical Garden |
late March 2009 at Tsukuba Botanical Garden |