Loktokong is an erect, much-branched, nearly smooth herb. Stems are prominently 4-angled. Leaves are long-stalked, thin, ovate to oblong-ovate,glandular and hairy on both upper and lower surfaces, with both ends pointed and with toothed margins. Flowers are lilac or pink, numerous, crowded, and borne in racemes. Calyx, in fruit, is spreading or somewhat reflexed.
– An introduced weed.
– In open, waste places, usually wet or damp soil, and widely scattered in settled areas in the Ilocos Norte, Pampanga, Rizal, Bataan, Laguna, and Quezon Provinces in Luzon; and in Mindanao (Cotobato).
– Also occurs in tropical Africa and Asia, through Malaya to tropical Australia.
– Leaves and flowers yield an essential an essential oil with main components of ethyl-eugenol (39%), methyl-isoeugenol (8%), limonene (7%), 1,8-cineole (eucalyptol, 5%), ß-elemene (5%), ß-caryophyllene (5%), ß-selinene (4%), citronellal (3.5%), geranyl acetate (2.9%), a-humulene (2.4%), isobornyl acetate (2%) and d-cadinene (2%).
– Yields alkaloids, phenols, flavonoids, triterpenes, coumarins, saponins, and sterols.
– Aromatic; belongs to the mint family, and closely allied to coleus and basil.
– Repellent, mosquitocidal.
– Studies have shown mosquitocidal, repellent, antimicrobial, anticonvulsant properties.
– Oral consumption of leaves as decoction or infusion reported to cause mouth ulcers.
– Eugenol is toxic in large amounts and can cause contact dermatitis.
– Leaves used to flavor food.
– Leaves used as tea.
– Caution: Reported to cause oral ulcers.
– In Java, crushed leaves used as sedative; also, applied to sprains.
– Externally, decoction used as lotion.
– Decoctions used for epilepsy, heart palpitations, neuralgia and convulsions.
– Infusion of fruit taken for parturition in case of delayed birth.
– Leaf sap squeezed into nostrils of children to induce sneezing to cure headaches.
– In Cameroon, leaves used for infectious diseases and gastroenteritis.
– Repellent: Burning of plant used to repel mosquitoes and snakes.
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