I just took over an allotment and in it there's this plant that has long black pods that contain what appear to be seeds.
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Sign up to join this communityHard to say because of pictures. But maybe it is Vicia sativa subsp. nigra (L.) Ehrh.. This plant is present in Europe.
I've had a look at the picture, but its pretty hard to tell for sure what it is, the leaves are sort of buried in with lots of other foliage, mostly grass by the looks of it. Most likely its one of the Baptisias though.