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Considering the need to produce effective bioherbicides to control weeds and thus reduce the contamination of environments through the use of agrochemicals in control of these plants, the scientific community has been studying the allelopathic activity of several species of Caatinga, once studies indicate that some species of this biome presentind to have activity allelopathic about other plants. On this, the present study aimed to evaluate the allelopathic potential and phenolic composition of extracts of Libidibia ferrea Mart. ex Tul. on seed germination and seedling development of Calotropis procera (Aiton) WT Aiton. and Cenchrus echinatus L. For the allelopathy test, leaf, bark and root extracts, both hot (100 °C) and cold (25 °C), were used, followed by a control group (distilled H2O). Phytochemical prospecting was performed by High Performance Liquid Chromatography (HPLC). The results showed that the hot L. ferrea bark extract has allelopathic activity on C. procera and C. echinatus, which was observed in all parameters analyzed. The phytochemical results showed that L. ferrea extracts present several phenolic compounds which are possibly responsible for the results observed against the two weed species studied, with standing out Gallic acid, Catechin, Caffeic acid, Ellagic acid, and Quercetin. It is therefore necessary to isolate these compounds in view of a potential future use for L. ferrea extracts in the production of a bioherbicide.

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Cereus jamacaru DC subsp. jamacaru, has been suffering from severe anthropic pressure, in addition, when their seeds are dispersed, some end up not germinating due to the action of allelochemicals. Therefore, the present study was to evaluate the allelopathic effect of the essential oil (EO) from four species over C. jamacaru germination, as well as to identify their constituents. Four plants were selected for EO extraction (Mesospherum suaveolens (L.) Kuntze, Lantana montevidensis (Spreng.) Briq., Lantana camara L., and Tarenaya spinosa (Jacq.) Raf.) and the chemical analysis was performed by GC-MS. In order to evaluate the allelopathic activity of the EO's, the C. jamacaru seeds were treated with the EO's. The results showed that the EO's presented heterogeneity in their composition, with M. suaveolens presenting the highest number of constituents (44), followed by L. camara (26), T. spinosa (23) and L. montevidensis (22). All the oils negatively affected the C. jamacaru germination percentage in a concentration-dependent manner. Regarding the GVI, the M. suaveolens, L. montevidensis and L. camara OEs significantly decreased this index at all analyzed concentrations. Based on the results obtained, it is suggested that C. jamacaru should not be sown close to the aforementioned aromatic species in reforestation programs.

ResumoLantana camara L., conhecida popularmente por camará, pertence à Família Verbenaceae é um arbusto infestante e ornamental, é uma espécie típica das Américas e África, nativo do Brasil e Uruguai, distribuído por todos os Estados brasileiros. Suas folhas são utilizadas popularmente no tratamento de coceiras, dor de estômago, dor de dente, reumatismo, cortes, gripe, asma, bronquite e anti-séptico. Com este trabalho objetivou-se analisar os potenciais farmacológicos de L. camara. A pesquisa foi pautada em revisão de literatura, utilizando principalmente sites de bancos de dados on-line como "Scopus", "Springerlink", "Scielo" e "Doaj".De modo geral, a espécie apresenta vários artigos publicados em periódicos da subárea "Farmacologia e Toxicologia", ficando evidente neste trabalho que a espécie em estudo apresenta várias atividades e utilidades na medicina popular. Onde todas as suas partes apresentam algum tipo de atividade, tanto biológica (antimicrobiana, fungicida, inseticida e nematicida) quanto farmacológica (antioxidante, antiinflamatório e atividade diurética). Entretanto, a espécie apresenta toxicidade nos seus frutos, sendo então não recomendados pelas indústrias farmacêuticas os derivados dessa parte da planta. Sendo assim, fica evidenciado que essa espécie apresenta uma vasta variedade de atividades, podendo ser atribuídas pela presença de triterpenóides e taninos. Palavras-chave:Camará. Uso popular. Atividadebiológica. POTENTIAL OF MEDICAL Lantana camara L. (VERBENACEAE):A REVIEW Abstrat Lantana camara L., popularly known as chamber belongs to the Verbenaceae family is a weed and ornamental shrub, is a typical species of the Americas and Africa, native of Brazil and Uruguay, distributed in all Brazilian states. Its leaves are popularly used to treat itching, stomach pain, toothache, rheumatism, cuts, flu, asthma, bronchitis and antiseptic. This study aimed to analyze the pharmacological potential of L. camara. The research was based on literature review, using mainly online database sites like "Scopus", "SpringerLink", "Scielo" and "DOAJ". In general, the species has several articles published in journals of the subarea "Pharmacology and Toxicology", being evident in this work that the species under study presents various activities and uses in folk medicine. Where all the parts have some kind of activity, both biological (antimicrobial, fungicide, insecticide and nematicide) and pharmacological (antioxidant, anti-inflammatory and diuretic activity). However, the species has a toxicity in their fruit, and then not recommended by pharma derivatives that part of the plant. Thus, it is evident that this species has a wide variety of activities and can be assigned by the presence of triterpenoids and tannins.