1	"Leaves linear"	2
1	"Leaves lanceolate to widely ovate"	4
2	"Leaves persistent after 1 year, wiry, tough; cauline leaves many, reduced upward"	"Xerophyllum {Xerophyllum tenax}"
2	"Leaves deciduous after 1 year, not wiry, not tough; cauline leaves 0 or 1--2, much reduced"	3
3	"Perianth parts pale green-yellow to +- purple, without glands; ovary partly inferior (at base)"	"Stenanthium {Stenanthium occidentale}"
3	"Perianth parts white to +- yellow, with 1--2 distinct glands near base; ovary superior"	Toxicoscordion
4	"Leaves > 3, alternate; plant 1--2 m"	Veratrum
4	"Leaves 3, in 1 whorl subtending flower; plant < 0.7 m"	5
5	"Leaves petioled (subsessile), leathery; petals white (pink), generally purple-spotted"	"Pseudotrillium {Pseudotrillium rivale}"
5	"Leaves sessile or subsessile, not leathery; petals white, +- pink, +- yellow, or purple, not spotted"	Trillium