1	"Leaves with 3 major veins spreading from the base: parts of perianth separate "	Celtis
1	"Leaves with more than 6 pairs of parallel veins from midrib: perianth parts joined together "	2
2	"Leaf margins usually with teeth double and not bristle-tipped: fruit winged (samara) "	Ulmus
2	"Leaf margins lined with single bristle-tipped teeth: fruit not winged (drupe) "	Zelkova