Does look like solanum ptycanthum / Nightshade.

Agree with wcgypsy, it's Nightshade. And yes, like so many of the other solamum family (potatoes, tomatoes), the green parts and green, unripe fruits are poisonous. If you're uncomfortable, pull it out. The sap can be irritating so some people, so wear gloves. I believe, however, like tomatoes, the completely ripe berries are not poisonous, but that may not be enough for you to keep it in your garden :-)

Patty S.

Darn it! And I was hoping that I'd have a nice--and not deadly--berry surprise when I come back from my trip. :P

It looks so healthy too...

Thanks for the replies!

I think it is the one with the common name 'Jerusalem Cheery' or Solanum pseudocapsicum. I have one that has persisted for years, even though it is frosted back every year. Al

I believe it's this: Black Nightshade It's a bit invasive but you can make jams or bbq sauces with it. Don't eat the green berries, those are poison.