What's the difference between gamopetalous and monopetalous?

Gamopetalous

Definition:

• (a.) Having the petals united or joined so as to form a tube or cup; monopetalous.

Example Sentences:

Monopetalous

Definition:

• (a.) Having only one petal, or the corolla in one piece, or composed of petals cohering so as to form a tube or bowl; gamopetalous.

Example Sentences: