Do you need to learn the parts of a flower? For a start, look at this clear diagram provided by the American Museum of Natural History. For more descriptions of the flower parts and what they do, investigate "The Great Plant Escape".
This interactive flower dissection activity will give you even more practice in sorting and labelling, then will test your knowledge of flower parts. Once you're on this site, you can start the activity by clicking on OK in the "try this" box (it's not necessary to download). To reach the quiz, click on "Label" after you've dissected the flower. This activity includes clear, printable pictures with descriptions of what each flower part does.
If you learn well under pressure, you should look at this timed quiz. You'll notice that some diagrams, such as the one at this site, may include more terms than you'll see on other diagrams. You can play this game by clicking on "start" (there's no need to download), then begin pointing and clicking to label the parts. Try it out, and challenge yourself to keep shortening your time!
If you want more information, contact a librarian through your computer or at your local library.