I post this mystery courtesy of Sally Teschon for two reasons -- you can see this mystery plant at NY Botanical Gardens, and you can see the gardens' annual train show as well. The buildings -- almost all of them NYC landmarks -- are made from birch bark, acorns,  cinnamon sticks and other natural materials.

It's definitely worth the trip, especially if you've never seen a previous one.

You can read more about the train show here. Below is one of my favorite buildings --  Wave Hill House. The only thing missing is bird-walk leader Gabriel Willow in miniature.

But you really should I.D. that plant.