Mature cells with specific roles, divided into Simple (Parenchyma, Collenchyma, Sclerenchyma) and Complex (Xylem for water and Phloem for food). 2. Anatomy of Vegetative Organs This is usually the "meat" of any PDF on the subject:
If you are looking for academic-grade texts, I recommend searching for these specific open-access sources: Download ANATOMY FLOWERING PLANTS pdf
Plants are composed of specialized groups of cells that work together: Mature cells with specific roles, divided into Simple
The internal structure of Dicot vs. Monocot roots, focusing on the epidermis, cortex, endodermis, and the vascular cylinder (stele). Mature cells with specific roles
For classic botanical texts if you are interested in the history of the science. Quick Study Tip