Cymbopogon traninhensis (A. Camus) Soenarko

This species is very close to Cymbopogon khasianus, with the erect, purplish compound panicle typical of that species, but has slightly longer, more broadly winged spikelets.

Perennial. Culms tufted, 1.5–2 cm tall, ca. 5 mm in diam., nodes glabrous or pubescent. Leaf sheaths glabrous or pubescent at base above node; leaf blades linear, up to 75 × 1–1.3 cm, abaxial surface bearded at sheath junction, otherwise glabrous, margins scabrid, base gradually narrowed, apex finely acuminate; ligule 3–6 mm. Spathate compound panicle narrow, erect or slightly spreading, usually purplish, ca. 50 cm or more, branched several times, spathes in lax clusters; spatheoles 1–2 cm; racemes 2–2.5 cm; rachis internodes and pedicels ciliate on margins;pedicel of homogamous pair not swollen. Sessile spikelet narrowly obovate, 5.5–7 × 1–1.5 mm; lower glume flat or shallowly concave below middle, frequently pubescent in depression, often transversely wrinkled, sharply 2-keeled throughout, keels winged above middle, wings 0.3–0.5 mm wide, 2–5-veined between keels; upper lemma awned; awn 1–2 cm. Pedicelled spikelet 5–5.5 mm.

Dry rocky or grassy hill slopes. Yunnan [NE India, Laos, Myanmar, N Thailand].

Cymbopogon confertiflorus (Steudel) Stapf var. traninhensis A. Camus, Bull. Mus. Natl. Hist. Nat. 26: 565. 1920; C. khasianus (Munro ex Hackel) Stapf ex Bor var. nagensis Bor.