1	"Outer, inner perianth parts generally dissimilar"	2
1	"Outer, inner perianth parts generally similar or +- dissimilar"	3
2	"Leaves 1--several, not mottled, abaxially not ribbed; sepals not striped, not grooved at base; petals wide, spreading to +- erect, enclosing stamens, pistil; stamens 6"	Calochortus
2	"Leaves 2, generally purple-mottled, abaxially ribbed; sepals striped, grooved at base; petals narrow, +- erect; stamens 3"	"Scoliopus {Scoliopus bigelovii}"
3	"Plants from scaly bulbs or corms or bulb-like rhizomes"	4
3	"Plants from rhizomes (from elongate bulb of 1--2 fleshy scales, generally with small, bead-like parts of persistent rhizome in <i>Erythronium</i>)"	6
4	"Perianth parts with distinct glandular area in lower 1/2"	Fritillaria
4	"Perianth parts without distinct glandular area"	5
5	"Leaves > 12, +- whorled (often some alternate); anthers attached at middle"	Lilium
5	"Leaves 2--6(12), alternate; anthers attached at base"	"Tulipa {Tulipa clusiana}"
6	"Leaves cauline, +- not reduced"	7
6	"Leaves +- basal, if cauline then much reduced"	8
7	"Flowers generally >= 2 in terminal clusters, without sharp bend at juncture of peduncle, pedicel; leaf base acute to cordate, clasping or not"	Prosartes
7	"Flowers generally 1(2) in leaf axils, with sharp bend at juncture of peduncle, pedicel; leaf base cordate, clasping"	"Streptopus {Streptopus amplexifolius var. americanus}"
8	"Fruit a berry; flowers not nodding; perianth white or pink to rose-purple; leaves not mottled"	Clintonia
8	"Fruit a capsule; flowers generally nodding; perianth white with yellow base, cream, yellow, or pink; leaves often mottled"	Erythronium