Culms 50-130 cm. Ligules to 1.5 mm; blades 15-45 cm long, 2-8 mm wide. Panicles 20-50 cm long, 8-25 cm wide. Spikelets (3)5-8 mm long, 3-5 mm wide. Lower glumes 3-4 mm; upper glumes 3.5-4.5 mm; callus hairs to 1.5 mm; lemmas 4.5-6 mm, glabrous or shortly pubescent, veins glabrous, entire or with 3 minute teeth; paleas glabrous; anthers 2-3.6 mm, yellow to reddish-purple; lodicules 2, truncate. Caryopses oblong, terete. 2n = 25.
Redfieldia flexuosa grows on sand hills and dunes. It is a common and important soil binder in blowout areas and has been planted for that purpose beyond its native range. It is only fair livestock forage but, because it grows in areas subject to blowout, this should not be of concern. Kearney and Peebles (1951) cited one specimen from Arizona (Hough 119) and described the species as "very rare" in that state. John Reeder (pers. com.) stated that, despite repeated searching, he had been unable to find the species in Arizona and suggested that the Hough specimen may be mislabeled.