What is a flattish or convex flower cluster, of the centrifugal or determinate type, differing from a corymb chiefly in the order of the opening of the blossoms called?

cyme — A flattish or convex flower cluster, of the centrifugal or determinate type, differing from a corymb chiefly in the order of the opening of the blossoms. (Webster's 1913.)

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