UPDATE:
I just found out that it’a Giant Spider Lily (Crinum asiaticum).
I don’t low the name of this plant; it was here when we moved in twenty-five years ago, but it blooms every summer and the fragrance is strongest after the sun sets.
How about helping me solve the mystery — if anyone knows what it is, please let me know!
Enchanted Seashells by Princess Rosebud 