No interactions present.
Setaria viridis is the commonest of the bristle-grasses - I've seen it in 3 differnt tetrads. However this one seems to be rather sparsely bristled, and the bristles have a purplish cast, so perhaps it's something different.
Lat/Lng: 53.0289, -2.5765
OS grid ref: SJ614481
grassy strip between wheat (harvested) and maize crops.