Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; erect at the tip, or inclined at the tip; 200-400(-500) cm long; 7-15 mm diam.; woody; without nodal roots. Culm-internodes terete; thick-walled; 11-19 cm long; distally pruinose, or glabrous. Lateral branches dendroid; extravaginal; ascending, or spreading. Bud complement 40-80. Branch complement many; in a clump. Culm-sheaths deciduous; 9-19.5 cm long; glabrous; glabrous on margins; without auricles. Culm-sheath ligule 1-3 mm high; ciliolate. Culm-sheath blade triangular; demarcated but persistent; erect; 1.4-6 cm long; glabrous on surface, or scabrid; acuminate. Leaves 5-9 per branch. Leaf-sheaths deciduous; glabrous on surface, or pubescent; outer margin glabrous. Ligule an eciliate membrane, or a ciliolate membrane; 0.2-0.5 mm long; glabrous on abaxial surface, or pubescent on abaxial surface; truncate. Collar with external ligule. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath; petiole 0.1-0.2 cm long. Leaf-blades lanceolate; 4.9-10.3 cm long; 5-12 mm wide; coriaceous. Leaf-blade venation without cross veins. Leaf-blade surface glabrous.
Inflorescence a panicle; without bracts, or bracteate at branch bases, or bracteate at pedicel base; embraced at base by subtending leaf. Panicle contracted; lanceolate; 1-3 cm long. Primary panicle branches appressed. Panicle branches scabrous; glabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-6 mm long.
Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume orbicular; 0.05-0.2 mm long; 0.5-0.6 length of upper glume; membranous; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume oblong; 0.1-0.4 mm long; 0.05 length of adjacent fertile lemma; without keels; 0 -veined. Upper glume primary vein absent. Upper glume lateral veins absent. Upper glume apex truncate.
Basal sterile florets similar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret elliptic; 2.4-3.3 mm long; 0.33-0.5 length of fertile lemma; chartaceous; 1-3 -veined; without lateral veins, or distinctly veined; acute. Lemma of upper sterile floret elliptic; 3.3-3.6 mm long; 1.2-1.5 length of lower sterile floret; chartaceous; acute. Fertile lemma oblong; 6.1-7.2 mm long; coriaceous; without keel; 5-7 -veined. Lemma apex acute; mucronate. Palea 6.4-7.6 mm long; 4 -veined.
Lodicules 3; membranous. Anthers 3; 4.2-4.5 mm long. Stigmas 2.
Caryopsis with adherent pericarp; 3.7 mm long; purple; apex unappendaged. Embryo 0.33 length of caryopsis. Hilum linear; 0.75 length of caryopsis.