A new month and a new mystery! What can you tell us about this? What is it and why is it interesting?
You know the drill: leave us your thoughts in the comments below, and come back next week for the reveal!
Update 5/30: A commenter asked about watermarks, so here is an image of the full leaf. (Or at least more of the leaf—I didn’t take the photo so I’m not entirely sure of all the context. ^SW)