Topics covered include:
Leaf: general structure of simple and compound leaves; shapes, dissection types, types of margin, venation, arrangement.
Flower: general structure of a flower, grass flower and spike; symmetry types, corolla shapes, simple inflorescences, monopodial inflorescences. "Biology - Morphology of Plants" handbook will be a good biology helper!
Fruit: classification of dry and fleshy fruits.

The free version of plant reference "Biology - Morphology of Plants" includes one example of each characteristic of the structure of leaves, flowers and fruits (type of venation, corolla shape, etc.). Paid version costs $9.99.