Pterocarya stenoptera, common name Chinese Wing Nut, has gorgeous lime green seed catkins 12-14″ long each bearing up to 80 seeds. That’s pretty amazing in itself but when these seed catkins are dripping off of each limb of a tall tree the effect is stunning. The Wing Nut genus resides in the walnut family, or Juglandaceae, and is used for ornamental purposes in gardens around the world.