"Trees" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches.
This graph shows the total number of publications written about "Trees" by people in this website by year, and whether "Trees" was a major or minor topic of these publications.
To see the data from this visualization as text, click here.