Magnoliidae (or magnoliids) are a group of over 9,000 species of flowering plants, including magnolias, nutmeg, bay laurel, cinnamon, avocado, black pepper, and many others. They are characterized by trimerous flowers, pollen with one pore, and usually branching-veined leaves. Classification Traditionally, Magnoliidae is the botanical name of a subclass. The of a subclass will vary with the taxonomic system being used. The only requirement is that it must include the family Magnoliaceae. More r… (More on Magnoliidae)