 The study aimed to analyze the micromorphology of secretory structures in oil-bearing industrial plants from the lame ASE family using light and scanning electron microscopes, estimate volatile substances content using GCMS, and perform qualitative and quantitative analysis of essential oils. The results showed that two types of lame ASE type glandular trichomes were identified, short and long-stalked capitate and peltate trichomes with single and bicellular secretory capitulum. Capitate trichomes were densely distributed on the surface of the epidermis, while peltate trichomes were sparse but regular and situated in depressions. Glandular trichomes were more frequent on leaves than on stems. The cuticle of the abaxial side of the leaf was characterized by larger average diameter peltate trichomes compared to the adaxial side. Peppermint produced the largest structures accumulating essential oil on the leaves, while sage had the highest average diameter of peltate trichomes on the stem. Lemon balm had the greatest density of glandular trichomes and the lowest content of oil in green parts. The isolated essential oils contained predominantly moniterpenes and sesquiterpenes, which determines their applicability for various purposes. This article was authored by Radoslaw Kowalski, Grzina Kowalska, Monica Jankowska, and others. We are article.tv, links in the description below.