The African Lily or blue Agapanthus.
African lily definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an African plant (Agapanthus africanus) of the lily family with blue or white, funnel-shaped flowers
African lily definition by American Heritage Dictionary
A South African rhizomatous plant (Agapanthus africanus) having violet funnel-shaped flowers grouped in umbels. Also called agapanthus, lily of the Nile.