Unknown seed pods

Unknown seed pods

Observation - Unknown seed pods - UK and Ireland. Description: Seed pods of various sizes containing on average 5 smaller brown seeds similar in size to a cleaver.

Seed pods of various sizes containing on average 5 smaller brown seeds similar in size to a cleaver.
A large quantity of these seed pods were found within a load of organicly grown oats post harvest so I don't know what the plant they came from looks like.
When processed with the oats there is quite a strong smell not dissimilar to licorice. Charlock has a similar smell.