Mchaichai (pia: mzumari; jina la kisayansi: Cymbopogon spp.) ni jina la nyasi za nusufamilia Andropogoneae. Majani yake yana harufu na ladha ya limau, kwa hiyo hunywewa kama chai, yakiwa peke yake au kama mchanganyiko na majani ya chai. Lakini spishi kadhaa, kama mchaichai fukuza-mbu, hazinyweka. Jenasi hii ina spishi nyingi ambazo 11 zinatokea Afrika. Cymbopogon caesius (Kachi grass) Cymbopogon citratus, Mchaichai wa Kawaida (Lemon grass) Cymbopogon commutatus, Mchaichai-fukizo (Incense grass) Cymbopogon densiflorus Cymbopogon dieterlenii, Mchaichai Kusi Cymbopogon giganteus, Mchaichai Mkubwa Cymbopogon marginatus Cymbopogon nardus, Mchaichai Fukuza-mbu (Citronella grass) Cymbopogon nervatus Cymbopogon pospischilii Cymbopogon schoenanthus, Mchaichai-ngamia (Camel grass) Cymbopogon ambiguus (Australian lemon-scented grass) Cymbopogon annamensis Cymbopogon bhutanicus Cymbopogon bombycinus Cymbopogon calcicola Cymbopogon calciphilus Cymbopogon cambogiensis Cymbopogon clandestinus Cymbopogon coloratus Cymbopogon dependens Cymbopogon distans Cymbopogon exsertus Cymbopogon flexuosus (East Indian lemon grass) Cymbopogon gidarba Cymbopogon globosus Cymbopogon goeringii Cymbopogon gratus Cymbopogon jwarancusa Cymbopogon khasianus Cymbopogon liangshanensis Cymbopogon mandalaiaensis Cymbopogon martinii (Palmarosa) Cymbopogon mekongensis Cymbopogon microstachys Cymbopogon minor Cymbopogon minutiflorus Cymbopogon nervatus Cymbopogon obtectus Cymbopogon osmastonii Cymbopogon pendulus Cymbopogon polyneuros Cymbopogon procerus Cymbopogon pruinosus Cymbopogon queenslandicus Cymbopogon quinhonensis Cymbopogon rectus Cymbopogon refractus (Barbed wire grass) Cymbopogon tortilis Cymbopogon tungmaiensis Cymbopogon winterianus Cymbopogon xichangensis Mchaichai mkubwa Mchaichai fukuza-mbu Mchaichai-ngamia Australian lemon-scented grass C. bombycinus East Indian lemon grass C. goeringii Cymbopogon martinii.png Palmarosa Barbed wire grass C. winterianus