This is an excellent page to refer to when discussing the anatomy of flowers and its membranes.
Here are images of flowers and their parts including the membrane of a flower. The diagrams are self explanatory and students should practice tracing and naming the parts. During flower pollination, this is one of the topics to discuss and learn more about the categories and tags related to this page.

Anatomy of a Yellow Lily
Anatomy of a flower
Membrane of a flower
Structure of a flower