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Mentha × cardiaca J. Gerard ex Baker - syn. Mentha ×gracilis Sole; Mentha × gentilis auct. (f.cardiaca) - Lamiaceae
Scotch mint, Scotch spearmint, Scottish mint, Scottish spearmint, ginger mint, red mint, Edelminze

= M. arvensis × M. spicata

Commercially cultivated for essential oil ('Scotch spearmint oil', CAS 8008-79-5, FEMA 4221).

A small (basic) part of the oil (10ppm) contained pyridine derivatives. „Among them, 2-acetyl-4-isopropenylpyridine is a major component and has a powerful grassy-sweet and minty odor.“
[Ishihara, Masakazu, et al. „New pyridine derivatives and basic components in spearmint oil (Mentha gentilis f. cardiaca) and peppermint oil (Mentha piperita).“ Journal of agricultural and food chemistry 40.9 (1992): 1647-1655]

The essential oil of M.cardiaca cv.MCAS-2 contained mainly carvone (49.4-74.0%) and limonene (2.6-32.8%) at all developement stages. Minor components were 1,8-cineole (0.2-2.1%), 3-octanol (0.8-1.8%), menthone (0.1-0.2%), isomenthone (0.1-0.4%), menthyl acetate (0.1-0.2%), terpinen-4-ol (0.1-3.3%), neomenthol (0.1-0.2%), and menthol (0.1-4.2%).
[Bahl, J. R., et al. „Quality evaluation of the essential oils of the prevalent cultivars of commercial mint species Mentha arvensis, spicata, piperita, cardiaca, citrata and viridis cultivated in Indo-Gangetic plains.“ Journal of Medicinal and Aromatic Plant Sciences 22.1B (2000): 787-797]

Like in spearmint oil (from M.spicata, carvone found 73.2%), the carvone content of M.cardiaca is also 60-70% (found here 60.9%). But M.cardiaca typically has a higher limonene content of up to 20 % (found 21.5%; M.spicata 7.5%). High menthone content (M.cardiaca 1.3%; M.spicata 0%) was recognized as an prime indicator of Scotch spearmint oil. Minor components were also 1,8-cineole (2.2%), cis-carveol (1.4%), and β-myrcene (1.1%).
[Chowdhury, Jasim Uddin, et al. „Chemical constituents of essential oils from two types of spearmint (Mentha spicata L. and M. cardiaca L.) introduced in Bangladesh.“ Bangladesh Journal of Scientific and Industrial Research 42.1 (2007): 79-82]
https://www.banglajol.info/index.php/BJSIR/article/download/359/354