This explains how trees and shrubs get wider over time. It covers the activity of the vascular cambium, the formation of , and the development of the periderm (bark). Where to find reliable PDFs
When you download your PDF, pay close attention to the (Dicot vs. Monocot). Most exams and practicals focus heavily on the differences in their vascular bundle arrangements. Download ANATOMY FLOWERING PLANTS pdf
The gold standard for a clear, concise introduction to "Anatomy of Flowering Plants." This explains how trees and shrubs get wider over time
If you are looking for academic-grade texts, I recommend searching for these specific open-access sources: the formation of