1	"Leaf length not >> (often +- =) width; catkin pendent, bract cut into narrow segments; staminate flower with 8--60 stamens; perianth modified into non-nectariferous, cup- or saucer-shaped structure; winter bud scales > 3"	Populus
1	"Leaf length generally >> width; catkin erect, bract entire; staminate flower with (1)2(10) stamens; perianth reduced to adaxial nectary (rarely also with abaxial nectary, then free or fused into shallow cup); winter bud scale 1"	Salix