Willow Trees or bushes with simple leaves and tiny flowers in catkins. Fruit is a small capsule containing tufted seeds.
Beech Oak, chestnut and beech trees have simple leaves. The tiny flowers are in dangling catkins; fruits are acorns or nuts in husks.
Birch Trees or bushes with simple leaves and tiny flowers in catkins. Fruit can be a nut in a husk, a cone, or a papery capsule.
Walnut Trees with pinnately compound leaves and tiny flowers in catkins. Fruit is a husk containing a hard-shelled nut.
Mulberry Trees with simple leaves and tiny flowers in catkins. Fruit is a compound berry.