umbel

Concise Oxford English Dictionary © 2008 Oxford University Press:
umbel /ˈʌmb(ə)l/

▶noun Botany a flower cluster in which stalks of nearly equal length spring from a common centre and form a flat or curved surface, characteristic of the parsley family.

– derivatives
umbellate adjective.

– origin C16: from obs. Fr. umbelle or L. umbella ‘sunshade’.