Pleuropogon refractus is a species of grass known by the common name nodding semaphoregrass.

It is native to the west coast of North America from British Columbia to northern California, where it grows in moist meadows, marshy areas, and shady forests.

Pleuropogon refractus is a perennial bunchgrass growing to a maximum height around 5 feet.

[3] The inflorescence bears widely spaced cylindrical spikelets which hang sideways off the stem, resembling semaphore signals.

They can differentiated by height, Pleuropogon refractus is taller, and they have different ranges.