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:
Plants are composed of specialized groups of cells that work together: Download ANATOMY FLOWERING PLANTS pdf
The study of flowering plants (Angiosperms) generally breaks down into three major structural levels: 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
The "growth engines" of the plant. Includes Apical meristems (roots/shoots tips for length) and Lateral meristems (vascular cambium for thickness).
For classic botanical texts if you are interested in the history of the science. Quick Study Tip