Wonder if this might be the much asked about pokeweed.

Jack-in-the-pulpit's (Arisaema triphyllum) leaves are gone when its berries put on their show. The stalk the berries are on disintegrates pretty rapidly too. FataMorgana Here is a link that might be useful:

pebbles >I don't know the name of it or I would have called poison control. purple.. >Get off the internet & call 911! Pebbles.... You don't have to know what it is before you call, at the least, poison control, even if there are no symptoms. Call immediately! Poison control will have much faster ways to id what he ate, and assess the risks re the berries he ate, and they will have fast coordination with 911 if necessary. ***If there are *any* symptoms at all, or poison control seems to be slowish, go for 911!*** This is especially important for someone as young as 2! Very tiny quantities of plant toxins can take just a little while to digest, and everything seems normal, and then they can suddenly hit like a ton of bricks on that little body. When something like this happens, call poison control. If it is 'no problem', they will check it out and will still be glad you called them. Trust me, they actually prefer giving information rather than dealing with crises. *This time*, you were very, very, very lucky.... The internet is not the place to potentially trust your toddler's life to.... Agreeing with purpleinopp, in full, and in spades....

could it be an escaped house plant? Berries look like Solanum pseudocapsicum another pic with something to guess the scale could help