Mariangela Melato, an Italian actress who achieved fame alongside Giancarlo Giannini portraying complicated relationships in the provocative films of Lina Wertmüller, including “The Seduction of Mimi” and “Swept Away (by an Unusual Destiny in the Blue Sea of August),” died on Friday in Rome. She was 71.

She had been admitted to a hospice with cancer 20 days ago, said Giuseppe Casale, the medical director at that facility.