I found seeds on the street on a windy day in February and believed it to be a physalis. Having sown them and seeing the seedlings now, I'm sure it isn't what I expected, but what is it?
I was thinking in the first place that is a Physalis peruviana because the seeds were inside a papery, light brown calyx. The seeds were black with the size of a pea (4mm in diameter). Later on I saw real physalis seeds and cracked one of my seeds open to see whether there are smaller once inside or not. Not the case.
I planted them 6 week ago. I'm now confronted with one plant per seed. Produced leaves are brown-reddish in the beginning and then turn green and resemble oak-leaves in some way . The stem makes me guess that will become a wooden plant - a tree or a shrub.
Here a picture of the seedling: