Hackberry, Celtis ?

Well, that would be cool to find! B)

But, hackberry leaves are apparently narrower and only 2"-5" long.. :(

http://farm5.staticflickr.com/4056/4703142961_d51bc936c9_z.jpg

Here is a link that might be useful: Common Hackberry

It's hard to tell how many different plants are mixed in there.
The twigs and two or three of the leaves look very much like a Tilia, heart-shaped and ending with a tipp. The others don't look too typical for a Tilia.

Could be some stressed seedling, and if it has been cut back, the new leaves tend to be much larger.

Of Celtis australis there are seedlings quite frequently popping up in my area. And those look different.

Bye, Lin

Here's these same pics zoomable: 1 & 2

When you zoom in, you can see how the leaf margins are finely-serrated...

This couldn't be Fallopia japonica (Japanese Knotweed), could it? I think the mystery plant looks more like a tree's branch, than a bush's...but the leaves just look quite similar.

Although now that I look at it again, Mulberry is looking quite possible...with its fine leaf serrations and slightly-leathery appearance. Maybe even a Morus rubra hybrid?

Not Japanese knotweed which is herbaceous, has a much different appearance with stems and leaves.

I think mulberry is likely.