Stout, rather rigid, extravaginal tufts, leaves < stiff, erect culms. Leaf-sheath stramineous to dull brown, with minute, appressed, scattered hairs. Ligule 0.3-0.5-(1) mm, membranous, truncate, minutely ciliate, abaxially scabrid, often asymmetric. Leaf-blade to 20 cm × 1.5-2.5 mm, rather stiff, flat, tapered towards tip, abaxially sparingly minutely scabrid, adaxially scabrid on ribs towards tip, minutely scabrid on margins. Culm 40-100 cm, internodes minutely scaberulous throughout, or glabrous but minutely scaberulous below panicle, variously purplish. Panicle 10-25 cm, erect, spike-like, often purplish, branches spreading at first; rachis, branchlets and pedicels closely short-scabrid. Spikelets numerous, close-set on branchlets, rather delicate. Glumes narrow-lanceolate, acute to acuminate, often suffused with purple; lower 3-4 mm, ≈ lemma, upper 3.5-5 mm, > lemma. Lemma 2.5-4 mm, sometimes purplish; awn 12-18 mm, very fine, column straight, awn curving above and twisted 2-3 times along whole length, inserted 0.6-0.9 mm below minutely bifid lemma-tip. Palea 2-3 mm, narrow-linear, keels scabrid above, tip ciliate. Callus hairs 0.3-0.5 mm. Rachilla prolongation c. 0.05 mm. Lodicules (0.4)-0.6-0.8 mm, hyaline, elliptic-oblong, unequally bilobed, occasionally minutely ciliate. Anthers 1, 1.2-1.4 mm in chasmogamous flowers, 0.6-0.8 mm in cleistogamous flowers. Caryopsis 2.0-2.3 × 0.3-0.4 mm; embryo 0.2-0.4 mm; hilum 1.8-1.9 mm.
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Culms erect, 30–95 (–120) cm long. Leaves: ligule 0.3–1.4 (–1.5) mm long, eciliate; blade 7–20 cm long, (1.5–) 2–5 mm wide. Inflorescence contracted, linear, 3–16.5 cm long, (0.5–) 2–3.5 cm wide. Spikelets linear [or lanceolate reported for D. montana in Simon et al. (2009)], 3.5–5.5 mm long, without rachilla extension. Callus 0.2–1 mm long, sparsely hairy or pubescent; hairs 0.35–0.75 mm long. Glumes unequal, membranous, shorter than to longer than lemma; lower glume 3–4 mm long, muticous, aristate or setiform; upper glume 3.5–5 mm long, setiform. Lemma lanceolate [or elliptic reported for D. montana in Simon et al. (2009)], 2.5–4 mm long; awn arising (0.2–) 0.6–0.9 mm below apex, (5–) 10–22 mm long overall, curved (no distinction between column and bristle), slightly twisted with 1 or 2 twists [once-geniculate and not twisted reported for D. montana in Simon et al. (2009)]. Palea 0.25–3 mm long. Anthers 1 (3), 1.2–1.4 mm long [3, 0.4–0.5 mm long reported for D. montana in Simon et al. (2009)]. Caryopsis 2–2.6 mm long [2.8–3.2 mm long reported for D. montana in Simon et al. (2009)]. [See also Green (1994: 464).]
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