Here are the plants (genus) considered to be most closely related to Hemerocallis, the daylily (genus):
Agrostocrinum
Arnocrinum
Caesia
Corynotheca
Dianella
Eccremis
Geitonoplesium
Hensmania
Herpolirion
Hodgsoniola
Johnsonia
Pasithea
Phormium
Stypandra
Simethis
Stawellia
Thelionema
Tricoryne
I think the most recent molecular genetic analysis suggests that Simethis is the closest (could easily change with more research). But others that are close are Dianella, and Stypandra. Xanthorrhea the genus is more distant. All the above genera are included in the larger grouping of Xanthorrheaceae the family
http://en.wikipedia.org/wiki/X...
