What type of tree...

[Brandonbirch]

Need help identifying this tree in winter 
Southern Ontario 
Buds are opposite
Bark is smooth but speckled
Twigs go from greenish to purple at ends
Stumped???

 

 

[bluthum]

Might be box elder {Acer segundo] but I don't know much about trees up your way....

[thecfarm]

striped Maple,Acer pensylvanicum. Will have big leaves this summer.