I have these 5 maples. I am pretty sure that I can ID 2 of them correctly. Do we have any Maple Leaf fans in the peanut gallery? Anyone that can ID all 5 deserves the Cup. Disclosure... born in Cook County:)

#1


#2


#3


#4


#5

#1 Acer ginnala
#2 Norway Maple (Acer platanoides)
#3 Sycamore (Acer pseudo-platanus) http://digitalcollections.nypl...
#4 Acer saccharinum
#5 Acer spicatum http://calphotos.berkeley.edu/...
Perhaps it is a good

I thought #2 was a sugar maple?

#1, i think is an amur maple

Yes, my fault #2 was a sugar maple , There are a lot of similar, sugar has a deeper lobes.
yes, 1, i think is an amur maple , It is his other name, or tataricum, It is a small tree or shrub

#4 Acer saccharinum leaves reverse a silvery gray

Could #3 or #5 be a red maple?

There are several species of red maple, but it's the Common names. the main Acer rubrum, has the very drop of leaves, must be red flowers, blunt leaf without tips.
Here I have my doubts about the half leaves :
Red Maple (Acer rubrum)

by someone is the main character of red leaves, It is nonsense, 95% acer at least has red leaves in the fall

http://garden.org/plants/searc...

Acer rubrum is a North American endemit plant
look at the link some universities or BG

an example of the variability
There are male and female trees, but also bisexual - both male and female flowers on the one tree, but on the each other branch

http://www.na.fs.fed.us/pubs/s...
https://en.wikibooks.org/wiki/...
http://www.missouribotanicalga...
http://www.illinoiswildflowers...
http://journals.plos.org/ploso...
http://nativeplants.evergreen....
http://www.museum.state.il.us/...
http://www.pnwplants.wsu.edu/P...
http://dge.stanford.edu/DGE/Du...