Corymb

n.

1.

(Bot.) A flat-topped or convex cluster of flowers, each on its own footstalk, and arising from different points of a common axis, the outermost blossoms expanding first, as in the hawthorn.

Noun

1.

corymb - flat-topped or convex inflorescence in which the individual flower stalks grow upward from various points on the main stem to approximately the same height; outer flowers open first

inflorescence