Unknown shrub species

Opposite leaved shrub, 2 meters tall. Grey bark. Toothed leaves.
Collected from lake of the woods (N. Minnesota, E. Manitoba, etc.). Found in a mesic forest with elm, ash and manitoba maple. Looks like I missed the flowers, so I don't know where to start in the key.

Any hints? Thanks infinitely!

 

Look at Viburnum, see what might fit.

 

Great thought! I am seeing a lot of viburnum rafinesquianum. This must be some other species. Thanks again! This forum never fails to send me in the right direction.!

 

With leaf margins like that, I suspect Viburnum lentago.

 

Keys to lentago in Chadde. It has distinctively margined petioles as mentioned in Chadde and elsewhere. However this particular specimen has leaves that are a few cm longer than the description in Gleason & Cronquist.

I don't know what else it could be, so I will be calling it Viburnum lentago, thanks again!

 

Could be larger shade leaves causing the extra length? Plants are physically plastic, so to speak, and in response to low-light conditions may produce larger (but thinner) leaves.

 

Good idea. It was under a full canopy.