a flat-topped inflorescence formed by a growth pattern in which the initial stem and all subsequent emerging lateral stems terminate with a blossom
See cyme in American Heritage Dictionary 4
cyme
noun
A usually flat-topped or convex flower cluster in which the main axis and each branch end in a flower that opens before the flowers below or to the side of it.
Origin: Latin cȳma, young cabbage sprout, from Greek kūma, anything swollen, sprout; see cyma .