Plant Identification - Velvetleaf, Abutilon theophrasti

Hello!
What are your best plant identification resources in general?
And in particular, do you know what this is?
It's a weed I found in a corn maze. 6-7 feet tall, velevty stem, heart shaped seeds.
Thanks!

This is sometimes a good place to identify plants:

http://www.illinoiswildflowers.info/weeds/plants/velvetleaf.htm

Velvetleaf, Abutilon theophrasti











http://www.eattheweeds.com/velvet-leaf-fiber-and-food/

Thank you! Facinating info. I appreciate your help!