Mexico is the center of origin of the species popularly known as toronjil or lemon balm (Agastache mexicana Linton & Epling). Two subspecies have been identified and are commonly called purple or red (Agastache mexicana Linton & Epling subspecies. mexicana) and white (Agastache mexicana subspecies xolocotziana Bye, E.L. Linares & Ramamoorthy). Plants from these subspecies differ in the size and form of inflorescence and leaves. They also possess differences in their chemical compositions, including volatile compounds. Traditional Mexican medicine employs both subspecies. A. mexicana exhibits a broad range of pharmacological properties, such as anti-inflammatory, anxiolytic, and antioxidant. A systematic vision of these plant’s properties is discussed in this review, exposing its significant potential as a source of valuable bioactive compounds. Furthermore, this review provides an understanding of the elements that make up the species’ holistic system to benefit from lemon balm sustainably.

Background: Inhibition of quorum sensing systems (QSS-I) is a novel strategy in the treatment of bacterial infections. To date, plants are the major source of metabolites with this inhibitory activity. Thus, species of Mexican flora can be important resources for obtaining metabolites with QSS-I activity.Hypothesis: We hypothesized that extracts from species of the genus Ceiba have metabolites with inhibitory activity against bacterial quorum sensing systems.Species studied: Ceiba pentandra (L.) Gaertn. and Ceiba aesculifolia (Kunth) Britten & Baker f. (Malvaceae).Study site and years of study: We collected Ceiba bark in the municipalities of Tierra Blanca, Veracruz, and Acatlan, Oaxaca, in August 2013.Methods: We determined the effect of extracts from C. aesculifolia and C. pentandra against QSS-regulated phenotypes of Chromobacterium violaceum and Pseudomonas aeruginosa. Extracts were fractionated and the main metabolites were identified. As support in the identification of the species, we carried out an anatomical study of the bark.Results: Hexane and dichloromethane extracts of both species of Ceiba exhibited QSS-I activity. We identified four fractions rich in terpene and sterol compounds with the ability to attenuate virulence factors in P. aerugiosa. The histological analysis appears to support the presence of some differences in the barks that can facilitate identification of the two species.Conclusions: The extracts and fractions of the two species of Ceiba are sources of phytochemicals with the ability to regulate bacterial quorum sensing systems positively or negatively.

Salvia semiatrata Zucc. (Lamiaceae) is endemic to Oaxaca, Mexico, and is known for its analgesic properties. Terpenoids and phenolic compounds with antinociceptive potential have been characterised from this species. The aim of this research was to determine the variation in terpenoids and flavonoids in ethyl acetate extracts of S. semiatrata collected from ten different localities, as well as to evaluate the antinociceptive effect between plants with higher and lower contents of these secondary metabolites. Quantification of S. semiatrata compounds was performed via HPLC-DAD, whereas in vivo evaluation of the antinociceptive effect was performed via formalin test. The results showed that the most abundant groups of metabolites are oleanolic acid (89.60–59.20 µg/mg), quercetin (34.81–16.28 µg/mg), catechin (11.30–9.30 µg/mg), and 7-keto-neoclerodan-3,13-dien-18,19:15,16-diolide (7-keto) (8.01–4.76 µg/mg). Principal component and canonical correspondence analysis showed that the most contrasting localities in terms of compound content and climatic variables are Miahuatlán and Santiago Huauclilla. The differences in metabolite content between the two locations did not affect the antinociceptive effects evaluated at a dose of 300 mg/kg, p.o. In conclusion, the results indicate that S. semiatrata is effective in relieving pain, regardless of the site of collection, reinforcing its traditional use as analgesic.