The New Student's Reference Work/Actinomorphic Flowers

Ac′tinomor′phic (ak′tĭn-o-môr′fĭk) Flowers. Those whose parts are repeated uniformly about a center, like the parts of a radiate animal. Such flowers are often called “regular.” Although the name applies to all parts of the flower it is most commonly used in connection with the petals. When the petals are all about alike and equally spaced about the center, as in the buttercup and the rose, the flower is actinomorphic. The contrasting phrase is “zygomorphic flowers.” The noun form of the word is “actinomorphy.”