Right Answer:
You can tell this is Field Peppergrass because the plant is about 2 feet tall.  The plant also has numerous seed heads per plant.  This plant produces small white flowers that can help you to identify this plant.  Field Peppergrass has a shallow root system and located at the base of the plant are small arrow shaped leaves.  The seeds are small, dark brown, and have a rough seed coat.  The seed is pointed with an indention on one side. 
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