Festuca brachyphylla is a bright green perennial grass that is tufted or loosely cespitose and erect, growing without rhizomes. The grass has slender, low growing culms measuring 2–35 cm (0.79–13.78 in) tall that can reach 55 cm (22 in) when the grass is cultivated. The culms are glabrous and somewhat scabrous, becoming more puberulent towards the inflorescence, and are occasionally tinged purple at their base. The smooth or scabrous leaf sheaths are closed for half of their length. The sheaths remain at the basal tuft when dead. The ligules measure 0.1–0.4 mm (0.0039–0.0157 in). The capillary leaf blade are long and soft, measuring 2–6 cm (0.79–2.36 in) long and 0.5–1 mm (0.020–0.039 in) wide, and arise from the basal tuft. The inflorescences are typically cylindrical or ovoid panicles that are 1–3 cm (0.39–1.18 in) long, though they can occasionally be racemes. The panicles have one to two erect branches at each node that sometimes become spreading during anthesis. The pedicellate spikelets are purplish or bronze.[3] The spikelets measure 3.5–7 mm (0.14–0.28 in), each with two to four florets. The glabrous glumes are ovate to lanceolate and are much shorter than the spikelets. The lower glumes are 1.8–3 mm (0.071–0.118 in) and the upper glumes are 2.6–4 mm (0.10–0.16 in). The elliptical or lanceolate lemmas are membranous and become scabrous towards their apex. The lemmas are 2.5–4.5 mm (0.098–0.177 in) long. The terminal awns are 1–3 mm (0.039–0.118 in) long. The paleas are 3–5.5 mm (0.12–0.22 in) long. The anthers are 0.5–1 mm (0.020–0.039 in) long.[4][5] These short anthers distinguish the species from Festuca ovina.[6]
The spikelets are colored red to purple by anthocyanin pigments.[5]
The plant flowers from late June into July.[4]
