Buckthorn

Description:

Large bush (small tree) with many small black berries. These are very common around Toronto, but I have no idea what there are. The berries have a large seed in them -- see last photo on tip of my middle finger.

Habitat:

Small patch of 'green space' between industrial buildings.

Notes:

I met a friend of a friend at a bar the other night, and she told me that they were buckthorn. She also said that they were invasive... as much help as this was, I'm still not down to the genus level.