3.6.1. Global Perspective

The central aspect of bibliometric studies is to study the keywords in the publications and, through the relationships between them, to establish the clusters or scientific communities in which the different topics associated with a field of study can be grouped together. If keywords are extracted from the total number of publications, an overview can be made of the most used keywords in relation to the subject of medicinal plants (see Figure 8). As expected, the search terms are the main ones, but then, there are two indexing terms, Human and Nonhuman, and then Unclassified Drug and Plant Extract.

**Figure 7.** A collaborative network of authors with more than 40 publications on medicinal plants.

**Figure 8.** Cloudword of keywords in medical plants publications.

If the keywords are analyzed by country, and we do not take into account the search terms, the results are obtained in Table 3, where the four main keywords of the main countries that research this topic are shown. It can be seen that the terms: Unclassified Drug, Plant Extract, and Controlled Study, are the ones that dominate without a doubt.


**Table 3.** Main keywords by country.
