Editing Lilium (section)

====Species (Division IX)====
: All natural species and naturally occurring forms are included in this group.

The flowers can be classified by flower aspect and form:<ref>{{cite web |title=Application For Registration Of A Lily Name |author=The RHS International Lily Registrar |url=http://www.rhs.org.uk/plants/pdfs/plant-registration-forms/lily-name-registration |publisher=Royal Horticultural Society |access-date=6 June 2014 |archive-url=https://web.archive.org/web/20140522045522/http://www.rhs.org.uk/plants/pdfs/plant-registration-forms/lily-name-registration |archive-date=22 May 2014 |url-status=dead }}</ref>
* Flower aspect:
:*a up-facing
:*b out-facing
:*c down-facing
* Flower form:
:*a trumpet-shaped
:*b bowl-shaped
:*c flat (or with tepal tips recurved)
:*d tepals strongly recurved (with the Turk's cap form as the ultimate state)

Many newer commercial varieties are developed by using new technologies such as ovary culture and embryo rescue.<ref>{{cite journal|last1=van Tuyl |first1=J.M. |last2=Binoa |first2=R.J. |last3=Vancreij |first3=M. |last4=Vankleinwee |first4=T. |last5=Franken |first5=J. |last6=Bino |first6=R. |title=Application of in vitro pollination, ovary culture, ovule culture and embryo rescue for overcoming incongruity barriers in interspecific ''Lilium'' crosses  |journal=Plant Science |volume=74 |issue=1 |year=1991 |pages=115–126 |doi=10.1016/0168-9452(91)90262-7|bibcode=1991PlnSc..74..115V }}</ref>