Leaves??? HELP!!!?

I need to find Major chaichteristic unique to the tree for the folowing trees:

Silver Maple

Red Maple

Norway Maple

Sugar Maple

Flowering Dogwood

Hardy Catalpa

Red Bud

Lombardy Poplar

White Mulberry

Weeping Willow

Common Apple

Paper-White Burch

Ginkgo

Swamp Oak

Sweet Gum

Sycamore

Tulip Tree

Bur Oak

American Elm

Green Ash

Honey Locust

Kentucky Coffee-Tree

Staghorn Sumac

White Pine

Scotch Pine

Norway Spruce

Colorado Spruce

Eastern Red Cedar

Blue Ash

Chokecherry

heres an example: The Milky Juice at the base of a maple leaf indicates a norway maple.

can you either give me a few or a website where i can find that information.

Leaves??? HELP!!!?
for leafs try( is too much to write):

http://en.wikipedia.org/wiki/Leaf

http://en.wikipedia.org/wiki/Leaf_shape



see also:http://en.wikipedia.org/wiki/Tree



(and dont forget the links in this page.......)
Reply:its hard cutie



sorry
Reply:What the heck kind of Botany question is this? Work on your spell check more...
Reply:I agree with Lover - do your own home work!
Reply:you expect us to answer all that **** 4 u??? gosh lazy ***, do ur own work, dont let others do it 4 u!!!!!