Agrostis hendersonii is an uncommon species of grass known by the common name Henderson's bent grass. It is native to northern California and Oregon, where it is a rare member of the flora in scattered vernal pool habitats. It is an annual grass ranging in maximum height from 6 to 70 centimeters. It has short, narrow leaves only a few centimeters long. The inflorescence is a dense, narrow, cylindrical tuft no longer than 5 centimeters in length, made up of small spikelets with hairlike tips and bent awns.