Amethystea

{{short description|Species of plant}}

{{Speciesbox

|image = Amethystea caerulea 49117972.jpg

|display_parents = 2

|genus = Amethystea

|parent_authority = L.

|species = caerulea

|authority = L.

|synonyms =

• Amethystea trifida Hill
• Amethystea corymbosa Pers.
• Lycopus amethystinus Steven
• Amethystina Zinn

|synonyms_ref =

}}

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.{{Cite book|url=http://www.forest.go.kr/kna/special/download/English_Names_for_Korean_Native_Plants.pdf |title=English Names for Korean Native Plants |publisher=Korea National Arboretum |year=2015 |isbn=978-89-97450-98-5 |location=Pocheon |pages=350 |access-date=25 January 2016 |via=Korea Forest Service |url-status=dead |archive-url=https://web.archive.org/web/20170525105020/http://www.forest.go.kr/kna/special/download/English_Names_for_Korean_Native_Plants.pdf |archive-date=25 May 2017 }} It is native to China, Japan, Korea, Central Asia (Tibet, Xinjiang, Kazakhstan, Tajikistan, Kyrgyzstan), and parts of Russia (Altai, Chita, Irkutsk, Buryatiya, Primorye).[http://apps.kew.org/wcsp/namedetail.do?name_id=7965 Kew World Checklist of Selected Plant Families]Muldashev, 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.[http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200019498 Flora of China Vol. 17 Page 55, 水棘针 shui ji zhen, Amethystea caerulea Linnaeus, Sp. Pl. 1: 21. 1753. ]