Ovate beak grass is cespitose with mostly basal leaves. Inflorescence 10-30cm long and drooping. Spikelets are flattened by the spreading of the lemmas. 3-5-flowered, panicle is scabrous, long, slender, and few-flowered. First glume is triangular, 1.9-2.8mm, second glume is oblong, cuspidate, 2.4-4.3mm. Lemmas 5.2-6.8mm, abruptly rounded into a short cusp, smooth; callus glabrous. Grains are large. Sheaths are pubescent toward the top, blades are 20-40cm long, 10-18mm wide, with mid vein off-center.
Glumes and lemmas shorter than in D americana var americana.