Changes

*''Phalaris zizanioides'' L. (1771), *''Andropogon muricatus'' Retzius (1783), *''A. zizanioides'' (L.) Urban (1903).

*Vetiver (grass), khus, khus-khus (En). *Vétyver, chiendent odorant (Fr)

*Coarse, perennial grass forming large, dense clumps with a stout, compact, aromatic, branched, spongy rhizome and fibrous root system up to a depth of 4 m. *Culm erect, 1-1.5(-3) m tall, 2-8 mm in diameter, terete, solid, glabrous. *Leaf sheaths laterally compressed, 10-20 cm long, keeled; ligule a very shallow fimbriate rim, 0.3-1.7 mm long; blade linear, flat or folded, stiff, 30-75(-90) cm × 4-10(-15) mm, glabrous below, puberulent in lower upper side, scabrous along the edges and back of the midrib. *Inflorescence a well-exserted, terminal panicle, 15-40 cm long, with 6-10 whorls of up to 20 slender, articulating racemes up to 10 cm long; internodes of the racemes and pedicels filiform, slightly thickened apically; internode of spikelet bearing rachis slender, 5-6 mm long, glabrous or with short scattered hairs; spikelets .*Spikelets in pairs, 1 sessile and 1 pedicelled, 2-flowered, the pair falling as a unit; sessile spikelet 3.5-5.5 mm long, with well developed pointed, glabrous or pubescent callus, barren lower floret and perfect upper floret; glumes chartaceous, bearing papillose-based spicules or stiff hairs; lower glume lanceolate, folded about the mid-vein, as long as the spikelet, 7-veined; upper glume equal to or slightly shorter than lower glume, 3-veined; lower floret with hyaline, ciliate lemma and without palea; upper floret with lanceolate lemma, 3-4 mm long, 1-3-veined, with a short scabrid awn and palea oblong, 1.5-2.5 mm long, delicately hyaline, 1-veined, spinulose-hairy at the tip; stamens 3 with orange anthers about 2 mm long; pistil with glabrous ovary and 2 plumose, purple stigmas; lodicules 2, free, fleshy; caryopsis rarely formed, oblongoid to fusiform, apex slightly oblique; pedicelled spikelet more slender, 2.5-4.5 mm long; lower glume 3-7-veined, upper glume 3-veined; both florets staminate or with rudimentary stamens, anthers up to 2.5 mm long.