Foxtail Barley
Foxtail Barley, Hordeum jubatum, picks up the light like no other grass I know. A field of it can look like sparkling waves of soft amber.
Its seed dispersal method can make it a hazard to animals, the barbs on each awn can embed themselves into the flesh and cause infection. It can be deadly if eaten, piercing the intestinal track, but luckily no animal in would knowingly ingest it.
The Nature of the Hills 