Perianth
Make lists of families with many perianth parts, tri-merous, four-merous, and five-merous perianths. Are there any families that lack a perianth? What are tepals? Where would you find an example of tepals?
What is a hypanthium and which subclass (-es) includes families with hypanthia?
Make a list of families with sympetalous corollas.
Make a list of families with zygomorphic flowers.