HORTICULTURAL CLASSIFICATION OF THE GENUS LILIUM
The descriptions below give a brief outline of the range of characteristics shown by members of each Division, and may provide some guidance as to where to place a lily of unknown parentage. These outlines do not necessarily include every variation but try to describe what is typical or at least common in a Division.
Note: interspecific hybrids that have been given botanical hybrid names (such as L. x aurelianense, L. x parkmanii) are included in their appropriate Divisions, as are any cultivars and Groups derived from these hybrids.
Examples: L. x aurelianense is derived from sargentiae and henryi and so is placed in Div. VI; L. x parkmanii is derived from speciosum and auratum and so is placed in Div. VII, as is L. x parkmanii ‘George Woodriff’.
Division I Asiatic hybrids
Hybrids derived from the following species and interspecific hybrids: amabile, bulbiferum, callosum, cernuum, concolor, dauricum, davidii, L. x hollandicum, lancifolium (syn. tigrinum), lankongense, leichtlinii, L. x maculatum, pumilum, L. x scottiae, wardii and wilsonii.
Flowers usually small to medium sized, few to fairly numerous, bowl shaped, flat or with tepals recurved, usually with an open centre, up-, out- or down-facing. Flower colour often uniform, or with contrasting tepal tips and or white throat, rarely with contrasting white tepal margins. Spots absent, or when present, well defined and often rounded. Papillae, if present, usually inconspicuous. Conspicuous brushmarks sometimes present. Tepal-margins usually smooth or slightly ruffled, with relatively inconspicuous nectaries. Flowers usually with little or no scent. Infloresecence sometimes with secondary buds. Buds sometimes hairy. Leaves scattered, narrow to medium width.
‘Angela North’ I(c/d)
‘Black Eyed Cindy’ I(b/-)
Citronella Group I(c/d)
‘Connecticut King’ I(a/b)
‘Mont Blanc’ I(a/b-c)
‘Willow Wood’ I(a/-)
Division II Martagon hybrids
Hybrids of martagon type derived from the following species and interspecific hybrids: L. x dalhansonii, hansonii, martagon, medioloides and tsingtauense.
Flowers usually small, often numerous, mostly down-facing, typically with rather thick, recurved tepals and often of Turk’s cap form, and often borne in a narrow, cylindrical inflorescence; sometimes out-facing with tepals hardly recurved. Spots usually present, numerous, often on at least three-quarters of each tepal and sometimes on the edges of the outside. Tepal margins usually smooth. Flowers with little or an unpleasant scent. Buds often hairy. Leaves typically whorled, often rather broad. Bulbs often mauve or orange-yellow. Early flowering.
‘Claude Shride’ II(c/d)
‘Cranberry Dancer’ II(c/d)
L. x dalhansonii ‘Marhan’ II(c/d)
‘Orange Marmalade’ II(b/c-d)
‘Rose Tattoo’ II(c/d)
Division III Euro-Caucasian hybrids
Hybrids derived from the following species and interspecific hybrids: candidum, chalcedonicum, kesselringianum, monadelphum, pomponium, pyrenaicum and L. x testaceum.
Flowers mostly small to medium-sized, few to fairly numerous, often bell-shaped to Turk’s cap shaped, often down-facing, in a relatively short inflorescence. Flower colour often in rather pale muted shades. Spots absent to numerous. Brushmarks absent. Tepal margins smooth, often gently reflexed. Flowers often scented. Inflorescence lacking secondary buds. Leaves scattered. Many are lime-tolerant.
Caucasian Group III(c/d)
‘June Fragrance’ III(b-c/a-b)
‘Moonlight Madonna’ III(-/a)
L. x testaceum III(c/d)
Division IV American hybrids
Hybrids derived from the following American species and interspecific hybrids: bolanderi, L. x burbankii, canadense, columbianum, grayi, humbodltii, kelleyanum, kelloggii, maritimum, michauxii, michiganense, occidentale, L. x parboldtii, pardalinum, parryi, parvum, philadelphicum, pitkinense, superbum, vollmeri, washingtonianum and wigginsii.
Flowers often small to medium-sized, often in a pyramidal inflorescence, mostly down-facing. Flower colour often strong yellow to orange or orange-red, often with contrasting centre and tepal-tips. Spots often very conspicuous, distributed over at least half of each tepal, usually rounded and often surrounded by a paler halo. Papillae absent or inconspicuous. Brushmarks absent. Tepals rather narrow, margins smooth, usually gently or strongly reflexed. Flowers with little scent. Pedicels often long and slender. Buds usually without hairs. Leaves usually whorled (at least in part).
Bullwood Group IV(c/d)
Bellingham Group IV(c/d)
Del Norte Group IV(c/d)
‘Eric Mayell’ IV(-/-)
‘Lake Tulare’ IV(c/c-d)
‘Oliver Wyatt’ IV(c/d)
Division V Longiflorum lilies
Hybrids or selections derived exclusively from formosanum, longiflorum, philippinense and wallichianum.
Flowers medium-sized to large, often few, trumpet-shaped. Flower colour typically uniform internally (white). Spots, papillae and brushmarks absent. Tepal-margins smooth. Flowers usually scented. Inflorescence lacking secondary buds. Leaves scattered, narrow to medium width.
Formolongi Group V(-/a)
longiflorum ‘Slocum’s Ace’ V(b/a)
Division VI Trumpet and Aurelian hybrids
Hybrids derived from the following species and interspecific hybrids: L. x aurelianense, brownii, L. x centrigale, henryi, L. x imperiale, L. x kewense, leucanthum, regale, rosthornii, sargentiae, sulphureum and L. x sulphurgale (but excluding hybrids of henryi with all species listed in Division VII). Aurelian hybrids are derived from a combination of henryi and trumpet lilies.
Flowers medium-sized to large, trumpet-shaped, bowl-shaped, flat or with tepals reflexed (the flatter or star-shaped flowers usually with a shorter funnel-shaped base, so centre of flower is closed). Flower colour white, cream, yellow to orange or pink, often with a contrasting star-shaped throat and/or strong bands of colour outside. Trumpets usually scented without spots, papillae or brushmarks; other types often with spotting or small streaks gathered in two bands at the base and sometimes with conspicuous papillae. Tepal-margins smooth or twisted with irregular ruffling, tepal-tips often reflexed. Inflorescence sometimes with secondary buds. Leaves scattered, narrow to medium width.
‘Carnival Queen’ VI(b/c)
‘Gold Eagle” VI(b-c/c)
Golden Splendor Group VI(b-c/a)
Herald Angel Group VI(a/a)
L. x kewense ‘White Henryi’ VI(b-c/c)
Division VII Oriental hybrids
Hybrids derived from the following species and interspecific hybrids: auratum, japonicum, nobilissimum, L. x parkmanii, rubellum and speciosum (but excluding all hybrids of these with henryi).
Flowers usually medium-sized to very large, few to fairly numerous, usually bowl-shaped, flat or with recurved tepals. Inner tepals often very broad, margins often ruffled or twisted and usually overlapping at base so the flower has a more ‘closed’ centre. Flower colour mostly white to pink to purplish red, some golden yellow; ground colour often white, with a contrasting colour as a central ray, or suffused over the whole tepal, except (in many cases) at the margins. Spots absent to numerous and conspicuous, sometimes covering more than half of each tepal, variable in form but often with diffuse edges. Papillae often present and conspicuous, even when flowers are unspotted. Nectaries often large and conspicuous. Flowers usually scented. Leaves scattered, usually broad to very broad. Often late flowering.
‘Casa Blanca’ VII(b/b-c)
L. x parkmanii Imperial Silver Group VII(b/c)
‘Journey’s End’ VII(b/c)
‘Star Gazer’ VII(a/c)
‘Woodriff’s Memory’ VII(a-b/b)
Division VIII Other hybrids
Hybrids not covered by any of the previous Divisions (I-VII). Includes all interdivisional hybrids, such as longiflorum/Asiatic (LA) hybrids, longiflorum/Oriental (LO) hybrids, Oriental/Asiatic (OA) hybrids, and Oriental/Trumpet hybrids (Orienpets or OT hybrids). Hybrids of henryi with auratum, japonicum, nobilissimum, L. x parkmanii, rubellum and speciosum (that are excluded from Divs VI and VII) are placed here.
‘Amber Star’ VIII(c/c)
‘Elegant Lady’ VIII(b-c/a)
‘First Crown’ VIII(a-b/b)
‘Pink Jazz’ VIII(c/a-b)
‘Red Planet’ VIII(a-b/b
‘Wild Treasure’ VIII(b/a-b)
Division IX Species and cultivars of species
Includes all species and their subspecies, varieties and forms, and cultivars selected therefrom (excluding those derived exclusively from any one of the following: formosanum, longiflorum, philippinense and wallichianum, which are placed in Div. V).
auratum var. rubrovittatum ‘Crimson Beauty’ IX(b/c)
canadense var. editorum ‘Chocolate Chips’ IX(c/a)
lancifolium ‘Splendens’ IX(c/d)
leucanthum var. centifolium ‘Kristine’s Charm’ IX(c/a)
speciosum ‘Coral Queen’ IX(b-c/d)
NB: The above Classification is taken directly from The International Lily Register & Checklist (2007). This is still current as of May 2020. Other lists published elsewhere are outdated and erroneous.