Amethystea is a genus of plants in the family Lamiaceae, first described for modern science by Linnaeus in 1753. It has only one known species, Amethystea caerulea, commonly known as blue amethystea. It is native to China, Japan, Korea, Central Asia (Tibet, Xinjiang, Kazakhstan, Tajikistan, Kyrgyzstan), and parts of Russia (Altai, Chita, Irkutsk, Buryatiya, Primorye).Kew World Checklist of Selected Plant FamiliesMuldashev, A.A. (2011). New floristic records for Bashkiria. Botanicheskii Zhurnal. Moscow & Leningrad 96: 654-660.Sheremetova, S.A., Ebel, A.L. & Buko, T.E. (2011). Supplement to the flora of Kemerovo region since 2001 till 2010. Turczaninowia 14(1): 65-74.Flora of China Vol. 17 Page 55, 水棘针 shui ji zhen, Amethystea caerulea Linnaeus, Sp. Pl. 1: 21. 1753.
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