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Glechoma hederacea L. - syn. Nepeta glechoma Bentham. - Lamiaceae
gill-over-the-ground, ground ivy, bálsamo-do-campo (port.), Gundermann, Gundelrebe

Perennial creeping herb, up to 40cm high, native to Europe, southwestern Asia, naturalized in North America; stem base purplish; leaves petioled, reniform to reniform-orbicular, sparsely retrorse, coarsely crenate, apex rounded; cymes 2-4-flowered, corolla purple, funnelform, ca.0.7-1cm, upper lip straight, 2-lobed, lower lip obliquely spreading, middle lobe flabellate, lateral lobes ovate. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200019682

Before the cultivation of hops, this herb was widely used in Europe because of its bitter substances for preserving beer. Because of the bitter substances and essential oils, the plant was also used as a spice. The smell and taste is described as a resinous aromatic, minty and liquorice-like. https://de.wikipedia.org/wiki/Gundermann

Essential oil from Japan contained the monoterpen-ketones (-)-pinocamphone (spicy), (−)-menthone (minty), and (−)-pulegone (minty) as main components.
[Constituents of ground-ivy., Takemoto, T., Kusano, G., Hikino, H., Yakugaku zasshi: Journal of the Pharmaceutical Society of Japan, 86(12), 1966, 1162-1165]
[Hagers Handbuch der Pharmazeutischen Praxis, Springer 2010]

The overground parts, collected during flowering were used for healing „pain of the hips“, problems of the liver, and as diuretic.
[Von Gundelreb., Kreutterbuch, Leonhart Fuchs, 1543, Cap.CCCXXXVII]

Germacrene D (15.6-18.8%) was the dominant compound in hydrodistilled oils (0.02-0.03%) of G.hederacea collected at full flowering in Lithuania. Other major constituents were γ-elemene (9.7-16.0%), β-elemene (9.8-11.1%), iso-phytol + phytol (4.7-15.6%), (Z)-β-ocimene (4.7-5.6%), germacrene B (2.9-3.9%), β-ylangene (2.7-3.9%), 1,8-cineole (1.9-3.5%). Minor components were α-cadinol (1.1-2.3%), (E,E)-α-farnesene (1.0-1.9%) and β-gurjunene (1.0-2.0%) eg.
[Chemical composition of essential oils of Glechoma hederacea L. growing wild in Vilnius district., Mockutë, D., Bernotienë, G., Judpentiënë, A., Chemistry IJA, 16, 2005, 47-50] http://www.lmaleidykla.lt/publ/0235-7216/2005/3-4/Che_047_050N.pdf

The hydrodistilled essential oil (< 0.05%, v/w, on a dry weight basis) of aerial parts of Glechoma hederacea L. plants, which were transferred from five different natural habitats in Lithuania to the field collection, contained mainly germacrene D (5.5-15.5%), sabinene (6.3-12.3%), 1,8-cineole (5.1-41.6%), β-caryophyllene and caryophyllene oxide (7.3-19.3%,) and γ-elemene (9.6%).
[Chemical composition of the essential oils from Glechoma hederacea plants grown under controlled environmental conditions in Lithuania., Judzentiene, A., Stoncius, A., Budiene, J., Journal of Essential Oil Research, 27(5), 2015, 454-458]

Curtis, William, Flora Londinensis, vol.2 t.44[143] (1777-1778)
http://plantgenera.org/species.php?id_species=467169

Glechoma hederacea, CC BY-SA 3.0, Author: Andreas Kraska