Ethnobotanical investigation of medicinal and aromatic plants used in the traditional treatment of COVID-19 in the rural commune of Bni Hadifa, province of Al Hoceima (Central Rif, Northern Morocco)

Abstract

This ethnobotanical investigation was conducted in the rural commune of Bni Hadifa belonging to the Al Hoceima province (North of Morocco), to inventory the principal medicinal plants traditionally used to treat Covid-19. Ethnobotanical information was recorded from 84 inhabitants aged over 18 years in the different communes of the study area, using an ethnobotanical survey based on a questionnaire and semistructured interviews. Data were examined by surveying the relative citation frequency (RFC) and family importance value (FIV). The obtained results permitted the inventory of 40 aromatic and medicinal plants (MAPs) species owned by 20 families, the most important of which by their number of species were: Lamiaceae (12 species), Apiaceae (5 species), Asteraceae (3 species), and two species for each of Amaryllidaceae, Myrtaceae, and Rutaceae. Furthermore, the following species: Allium sativum, Thymus glandulosus, Lavandula dentata L, Citrus limon L, Eucalyptus globulus labill, Artemisia herba-alba, and Marrubium vulgare L were the most frequently cited by the RFC index. Leaves were found to be the common plant organ used to treat Covid-19, while decoction was the most frequent preparation mode. This study also showed that over 90% of the respondents proved the efficacy of the plants used against Covid-19. However, most of the users of these plants did not respect the administered doses and were unaware of the toxicity and lethal effects that could be caused by these plants when taking high doses. The results of this survey demonstrate that the plants used to combat Covid-19 may constitute a promising database for future research in the extraction and chemical analysis of potentially effective biomolecules against this virus.