Chrysopogon zizanioides, commonly known as vetiver (derived from the Tamil: வெட்டிவேர் věţţivēr) is a perennialbunchgrass of the Poaceae family, native to India. In western and northern India, it is popularly known as khus.
Vetiver is most closely related to Sorghum but shares many morphological characteristics with other fragrant grasses, such as lemongrass (Cymbopogon citratus), citronella (Cymbopogon nardus, C. winterianus), and palmarosa (Cymbopogon martinii). Vetiver can grow up to 1.5 metres high and form clumps as wide. The stems are tall and the leaves are long, thin, and rather rigid. The flowers are brownish-purple. Unlike most grasses, which form horizontally spreading, mat-like root systems, vetiver's roots grow downward, 2–4 m in depth.