The New Student's Reference Work/Strobilus

Strobilus (strō̇-bī′lŭs) (in plants), a name given to the cone-like cluster of sporophylls which is best displayed by equisetums, club-mosses and gymnosperms. In gymnosperms it often is called a flower, and it really stands for the flower in plants without floral leaves. It probably is the structure from which true flowers have been derived.