Centripetal

[PussyCat]

Expanding first at the base of the inflorescence, and
proceeding in order towards the summit.

[Jessica]

(noun) - a physical force acting upon an object that opposes centrifugal force, thus forcing an object to the center. The word originates from the roots [centri] (meaning center) and [petal] (like a flower). [Centri].....petal, kind of like Sesame Street.

[Jason Yan]

Moving or tending to move towards a centre.