Lilianae is a botanical name

Botanical name

A botanical name is a formal scientific name conforming to the International Code of Botanical Nomenclature and, if it concerns a plant cultigen, the additional cultivar and/or Group epithets must conform to the International Code of Nomenclature for Cultivated Plants...

, in use for a superorder (that is, a rank higher than that of order

Order (biology)

In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

). Such a superorder will of necessity include the family Liliaceae

Liliaceae

The Liliaceae, or the lily family, is a family of monocotyledons in the order Liliales. Plants in this family have linear leaves, mostly with parallel veins but with several having net venation , and flower arranged in threes. Several have bulbs, while others have rhizomes...

(and usually the order Liliales

Liliales

Liliales is an order of monocotyledonous flowering plants. This order of necessity includes the family Liliaceae, but both the family and the order have had a widely disputed history, with the circumscription varying greatly from one taxonomist to another...

). Terminations at the rank of superorder are not standardized by the ICBN and a similar superorder is sometimes called Liliiflorae

Liliiflorae

Liliiflorae is a botanical name, which may be used for a taxon at a rank above that of family, but not for a rank where Art. 16 or 17 of the ICBN prescribes a standardised ending....

.

Among the systems of plant taxonomy that recognise a superorder Lilianae is the Dahlgren system

Dahlgren system

One of the modern systems of plant taxonomy, the Dahlgren system was published by monocot specialist Rolf Dahlgren. His wife Gertrud Dahlgren carried on after his death.According to the extensive listing by Professor Reveal One of the modern systems of plant taxonomy, the Dahlgren system was...

 and the Thorne system (1992)

Thorne system (1992)

A modern system of plant taxonomy, the Thorne system of plant classification was drawn up by the botanist Robert F. Thorne . He replaced it in 2000 with a new system. These two systems were published in:...

: both placed it in subclass Liliidae

Liliidae

Liliidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used ; the only requirement being that it includes the family Liliaceae....

[=monocotyledons] of class Magnoliopsida

Magnoliopsida

Magnoliopsida is a valid botanical name for a class of flowering plants. By definition the class will include the family Magnoliaceae, but its circumscription can otherwise vary, being more inclusive or less inclusive depending upon the classification system being discussed.-Cronquist and...

[=angiosperms].