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The Scientific Classification of Daylilies Changed in 2009
Prior to 2009, the scientific classification of daylilies put them into the family Liliaceae. Many Liliaceae species, including that toxic tiger lily just mentioned (along with the commonly named Easter and Asian lilies), have long been known to be harmful to forms of animal life including humans, and so some came to assume that daylilies shared the specific toxic properties of lilies. They do not.
In 2009, under the APG III system, daylilies were removed from the Liliaceae family and assigned to the Xanthorrhoeaceae family, subfamily Hemerocallidoideae.
The Old and New Classifications of Hemerocallis
Unfortunately, many sources on the web and elsewhere have not taken this change of scientific classification into account.
Prior to 2009, the scientific classification of daylilies put them into the family Liliaceae. Many Liliaceae species, including that toxic tiger lily just mentioned (along with the commonly named Easter and Asian lilies), have long been known to be harmful to forms of animal life including humans, and so some came to assume that daylilies shared the specific toxic properties of lilies. They do not.
In 2009, under the APG III system, daylilies were removed from the Liliaceae family and assigned to the Xanthorrhoeaceae family, subfamily Hemerocallidoideae.
The Old and New Classifications of Hemerocallis
| Old Classification | New Classification - APG III |
|---|---|
| Kingdom: Plantae | Kingdom: Plantae |
| Subkingdom: Tracheobionta (Vascular plants) | clade: Angiosperms |
| Superdivision: Spermatophyta (Seed plants) | clade: Monocots |
| Division: Magnoliophyta (Flowering plants) | Order: Asparagales |
| Class: Liliopsida (Monocotyledons) | Family: Xanthorrhoeaceae |
| Subclass: Liliidae | Subfamily: Hemerocallidoideae |
| Order: Liliales | Genus: Hemerocallis |
| Family: Liliaceae (Lily family) | |
| Genus: Hemerocallis L. (Daylily) |
