Citron
A source of confusion is that "citron" or similar words in French (and other languages), and English are false friends, as they refer to the lemon. Indeed, into the 16th century, the English name "citron" included the lemon and perhaps the lime as well.
Chrysopogon zizanioides
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").