Are these trees the same?

[defensiblespace]

I'm studying for my arborist certification and two of the trees I am supposed to be able to identify are Platanus x acerifolia and Platanus hybrida. Yet when I try to look these trees up, they seem to be cross referenced. For example, when I go to this website searching for Platanus acerifolia, this pops up. http://www.cnr.vt.edu/DENDRO/DENDROLOGY/syllabus/factsheet.cfm?ID=94
Can anybody tell me if these trees are the same thing or not?

 

[S Mc]

Honest to Pete, that's just unfair!!

In California they should be having you identify Platanus x acerifolia perhaps as opposed to Platanus racemosa. But against Platanus hybrida? The London planetree IS a platanus hybrid.

Sylvia