1	"Leaf simple or 0"	2
1	"Leaf deeply dissected or compound"	3
2	"Leaves opposite; ovary chamber 1; fruit drupe-like"	"Cneoridium {Cneoridium dumosum}"
2	"Leaves alternate; ovary chambers 2; fruit a capsule"	"Thamnosma {Thamnosma montana}"
3	"Shrub or small tree; petals +- green-white, entire; fruit a round, +- flat, wing-encircled achene"	"Ptelea {Ptelea crenulata}"
3	"Perennial herb, subshrub; petals yellow, wavy to fringed; fruit a capsule"	"Ruta {Ruta chalepensis}"