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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Poales

Familia: Poaceae
Subfamilia: Panicoideae
Tribus: Andropogoneae
Subtribus: Rottboelliinae
Genus: Coix
Species: C. aquatica – C. gasteenii – C. lacryma-jobi

Coix L., Sp. Pl.: 972 (1753)

Type species: Coix lacryma-jobi L., Sp. Pl. 2: 972. (1753)


Lachrymaria Heist. ex Fabr., Enum.: 208 (1759), nom. superfl.
Lachryma-jobi Ortega, Tab. Bot.: 3 (1773), nom. superfl.
Lacryma Medik., Philos. Bot. 1: 177 (1789), nom. superfl.
Lithagrostis Gaertn., Fruct. Sem. Pl. 1: 7 (1788), nom. superfl.
Sphaerium × null Kuntze, Revis. Gen. Pl. 2: 793 (1891), nom. superfl.


Linnaeus, C. 1753. Species Plantarum 2: 972.
Govaerts, R. et al. 2013. Coix in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2013 Oct. 31. Reference page.
Simon, B.K., Clayton, W.D., Harman, K.T., Vorontsova, M., Brake, I., Healy, D. & Alfonso, Y. 2013. GrassWorld, Coix. Published on the internet. Accessed: 2013 Oct. 31.
Tropicos.org 2013. Coix. Missouri Botanical Garden. Published on the internet. Accessed: 2013 Oct. 31.
International Plant Names Index. 2013. Coix. Published online. Accessed: 31 Oct. 2013.

Vernacular names
English: Job's Tears
suomi: Kyynelheinät

Coix is a genus of Asian and Australian plants in the grass family.[3][4]

The best-known species is Coix lacryma-jobi, widely called Job's tears. Its variety Coix lacryma-jobi var. ma-yuen is cultivated in many warm regions as a source of food, medicine, and ornamentation.[5][6]



Coix aquatica Roxb. - China (Yunnan, Guangdong, Guangxi), Indian Subcontinent, Indochina, Peninsular Malaysia; naturalized in New Guinea
Coix gasteenii B.K.Simon - northern Queensland
Coix lacryma-jobi L. - China , Indian Subcontinent, Southeast Asia; naturalized in other parts of Asia as well as in southern Europe, Africa, the Americas, and various oceanic islands

formerly included

[2] see Chionachne Polytoca Tripsacum

Coix angulata - Tripsacum dactyloides
Coix barbata - Chionachne gigantea
Coix crypsoides - Chionachne gigantea
Coix dactyloides - Tripsacum dactyloides
Coix gigantea J.Koenig 1788 not J.Koenig ex Roxb. 1932 - Chionachne gigantea
Coix heteroclita - Polytoca digitata
Coix koenigii - Chionachne gigantea
Coix sulcata - Chionachne punctata

Formerly included in

This genus was formerly placed in the Maydeae, now known to be polyphyletic.[Sch 1]
Proteins and expression

Members of this genus produce their own variety of α-zein prolamins. These prolamins have undergone unusually rapid evolutionary divergence from closely related grasses, by way of copy-number changes.[Sch 2]

lectotype designated by Green, Prop. Brit. Bot.: 187 (1929)
Kew World Checklist of Selected Plant Families
Linnaeus, Carl von. 1753. Species Plantarum 2: 972 in Latin
Tropicos, Coix L.
Hill,A.F. 1952. Economic Botany, McGraw-Hill
Arora, R. K., 1977, "Job's tears (Coix lacryma-jobi) - a minor food and fodder crop of northeastern India." Economic Botany, Volume 31, issue 3, pages 358–366.

The Plant List search for Coix

Schnable, James C. (2015-04-29). "Genome Evolution in Maize: From Genomes Back to Genes". Annual Review of Plant Biology. Annual Reviews. 66 (1): 329–343. doi:10.1146/annurev-arplant-043014-115604. ISSN 1543-5008.

p. 331, "Maize and Tripsacum were previously grouped with a number of other grasses that have monoecious flowering patterns — the most widely known being Job’s tears (Coix lacryma-jobi) — into the Maydeae (74); however, molecular data revealed that this grouping was polyphyletic (61)."
p. 335, "Clusters of locally duplicated genes can also expand and contract rapidly, as shown by investigation of the 22-kDa α zein gene families in maize, sorghum, and coix, which appear to have experienced independent copy-number amplifications since the divergence of these three species (107)."

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