Poison Bulb (Crinum asiaticum).
This plant is native to tropical southeastern Asia. It is now a favorite landscape plant in Florida, the Gulf Coast, California and other warm climate areas. Flowers of Crinum asiaticum are shaped like tubes that flair open into a crown of narrow petals. The flowers are white and are arranged in clusters atop thick, succulent stems.
If you want more information about this flower, just search the plant's Latin (botanical) name on Google: