Tilia americana, basswood (or lime, or linden in Europe) are big deciduous trees in eastern Canada. This one is growing near Lake Huron in Ontario.
It's interesting; basswoods don't attract a lot of attention but they have been used by people for a wide variety of reasons over the centuries. Lime is the classic carving wood for medieval church sculptures. The flowers have been used for medicinal reasons. I remember when I was a kid, my Dad would cut small branches from this tree in the spring and make slide whistles for me and my brother.
According to this article a whistle can also be made from willow.
