"[2] Pleuropogon oregonus is a rhizomatous perennial grass, producing stems up to 90[2] to 95[3] centimeters tall.

The spikelets are up to 4 or 5 centimeters long and stick out from one side of the raceme.

[1] Pleuropogon oregonus is a grass has been considered rare as long as it has been known.

It is a wetland plant that grows in swampy meadows and by streams.

Associated species include Beckmannia syzigachne, Deschampsia caespitosa, D. danthonioides, Glyceria borealis, Hordeum brachyantherum, Carex athrostachya, C. nebrascensis, C. saxatilis, and Eleocharis palustris.