What in the world is this?

Any plant experts out there? Because I certainly have no idea what is going on with this leaf.

This is a leaf on an unknown vine that is growing among a large patch of wineberry, an invasive and nonnative bush that produces edible berries. This patch just happens to be in my yard. I noticed this leaf a few days after my son Will and I picked the plants clean of their berries. (We made jam for the first time and, boy, is it good.) 

The vine may be a wild grape, but I’m not positive. It is the only such vine growing among the wineberry, so far as I can tell. The leaf appears to have red double-sided daggers sticking out the top and bottom. Perhaps it is a growth coming from either direction. I have no idea. It is the only leaf that looks like this. Of the thousands of leaves surrounding it, this is the only one with this phenomenon.

So, any ideas??

Here are a few more photos. 

1 thought on “What in the world is this?

  1. I hope you get an answer to this. I had a very similar situation on several leaves on a branching plant, not a vine, and my sharp projections were shorter and shaped like rose thorns. Eventually, they turned black and disappeared (fell off or flew away?). I think it’s some kind of pest but I can’t find anything online, BTW, I’m in southwestern Connecticut.


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