Dissochondrus biflorus is a tall perennial grass with erect, tufted culms 60-120 cm tall and compressed, branching intravaginally above the base. The nodes are pubescent to villous. The leaves are simple and alternate, with flat, lanceolate, firm blades 15-30 cm long and 1-2 cm wide, with a long-acuminate apex. The upper surfaces of the leaves are glabrous, while the lower surfaces are scabrous, with scaberulous margins toward the apex. The leaves have parallel veins. The leaf sheaths are compressed-keeled, extending at the apex into two large, leaf-like, deciduous auricles up to 6 cm long. The sheaths are open and glabrous, loosely enclosing the culm. They are scabrous and puberulent at the collar, with a rounded to truncate ligule of 1 mm. The inflorescence is a narrow, cylindrical, spike-like panicle, 10-20 cm long, somewhat loosely flowered, with greater spacing between branches toward the base. The branches are short and appressed, with the axis being puberulent. Solitary bristles, green, 5-10 mm long, flexuous, and antrorsely scabrous, are usually present below each spikelet. The spikelets (pictured) are 2-flowered, with the first floret slightly more prominent, 2.5-3 mm long, glabrous, and ovate to ovate-lanceolate, subtended by a single persistent bristle. The glumes are membranous, with the first glume being about 1/4 the length of the spikelet and puberulent. The second glume is longer than the two florets, extending beyond them, puberulent, and 5-nerved. The florets are cartilaginous, with indurate, smooth, and nerveless lemmas that enclose the floret. The palea is similar in color and texture to the lemma, flat, ovate, and apiculate at the apex. The caryopsis (fruit) is glabrous and lenticular and remains enclosed within the floret. The plant typically grows on slopes in diverse mesic forests at 490–1,050 meters.