Objectives: The aim of this study is to investigate on some aromatic plants growing in Libya, their major volatile oils contents and traditional uses, indicating dangerous hazards facing plant biodiversity especially medicinal plants and measures taken to protect them. Methods: The study is mainly based on electronic database survey using Scopus, PubMed, and Science Direct, etc. and communication with Libyan local inhabitants of some areas. Gathered information has been evaluated and summarized in tables. Results: Aromatic plant of 41 species has been mentioned of medicinal value represented by 14 plant families and 29 genera. Three aromatic plant species growing in Libya are not recognized and used by Libyans. Endemic species are mentioned; Origanum cyrenaicum, Teucrium zononii and Ballota andreuzziana. Conclusions: Even though Libya remains as one of the most biologically diverse countries in the Mediterranean region, scarce information about aromatic medicinal plants could be found. Libya is also suffering from extreme biodiversity destruction and degradation due to Sahara expenses and climate changes and other reasons. To deal with the problem IUCN Centre for Mediterranean Cooperation has made a mission in Libya to promote projects.

In this study the volatile oils constituents of the inflorescence and unripe fruits of Crataegus azarolus L. and Crataegus pallasii Grisb. were investigated. Fifty-four compounds were identified by GC and GC-MS analysis. The major outstanding constituents of the essential oil in all samples (dried and fresh C. azarolus and dried C.

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