Species: 6.
Geography: North America, northern Asia, eastern Asia, naturalised: southern Asia and Europe.
- Acorus americanus (Raf.) Raf. - (American Sweet Flag), - Alaska, Canada and northern USA.
syn.: Acorus calamus var. americanus
- Acorus calamus* L.,
(Common Sweet Flag, Kalmus),
- Europe, temperate India and the Himalayas and southern Asia.
- Acorus gramineus* Soland.,
(Japanese Sweet Flag, Grassy-leaved Sweet Flag, Zwerg-Kalmus) ,
- Himalayas to Japan, Myanmar, Thailand, the Philippines
- Acorus triqueter Turcz. ex Schott, - eastern Asia, Japan and Taiwan.
syn. Acorus calamus var. angustatus
- Acorus latifolius Z.Y.Zhu, - China.
- Acorus xiangyeus Z.Y.Zhu, - China.
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