A conventional method for recording the structure of a flower. It uses a series of capital letters to identify parts: K = calyx; C = corolla; A = androecium; G = gynoecium. The number of components in each is indicated by a number; if the number exceeds 12, the symbol ∞ (infinity) is used. If the parts are fused the number is enclosed in brackets. If 1 whorl is fused to the next, they are enclosed by a single bracket drawn horizontally above them. The position of the ovary is indicated by a line; this is below the number following G if the ovary is superior and above it if the ovary is inferior. The formula is preceded by the symbol ⊕ if the flower is actinomorphic and ·|· or ↑ if it is zygomorphic.
Subjects: Plant Sciences and Forestry.