It is known that essential oil yielding plants belong to some specific families such as Lamiaceae, Lauraceae and so on. Is there any specific criteria to identify such oil yielding plants in field without chemical analysis? For survey of such plants?
In recent years, there are some new methods have invented and introduced for determining the qualitative content of the secondary metabolites of different organs of medicinal plants in which determine the efficiency of the essential oil and its qualitative content by using the minimum amount of them in the natural field. In this relation, there are some relevant online sources. The most important feature of these methods is the use of the at least biomass from living plant organs.
Oil-yielding plants can be identified in the field by their aroma. One can rub a plant's leaves or flowers in his/her hands and sense if they have any kind of fragrance. If yes, then it must be an aromatic plant. To confirm it further, try Google Lens. If you identify the plant's name, then the answer is clear. To obtain oil yield, plant material can be hydro distilled or other methods can be done as per convenience to extract essential oil.
Books/Articles may provide the simple and the best answers. Here, I would like to share some useful links for this question.
1. http://dx.doi.org/10.14302/issn.2576-6694.jbbs-18-2489
2. https://doi.org/10.1017/9781316286098.019
3. https://www.nhbs.com/oil-yielding-plants-book
4. https://plantlet.org/oil-yielding-plants/
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