Found near a horse pasture in Charleston SC
Little seed-like pods
these are the fruits / seed pods of peppergrass, in the genus Lepidium. The most common species is Lepidium virginicum, and that is most likely this one. The whole plant is a bit peppery to the taste, mostly when young. These are very common weedy native annuals or biennials.
Dr. Steven R. Hill, Botanist SCNPS