Sympetalies is a term used in botany to describe flowers whose petals are joined together to form a single structure.
Sympetalies is a technical term used by scientists who study plants.
Examples:
The lily and the morning glory are examples of flowers with sympetalies.
The scientist studied the sympetalies of the daisy.
Sympetalies make some flowers look like they are one big petal.
The sympetalies of the rose are very beautiful.
The sympetalies of the orchid are so joined together, they look like one piece.
The scientist learned about sympetalies in school.