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Luffas are vining annual plants that produce fruits for food and the luffa sponge. The young fruits of Angled Luffa are edible raw or cooked. Although two species produce a fibrous skeleton in the mature fruit, Smooth Luffa (Luffa cylindrica) is the preferred species for the luffa sponge. This species, C. acutangula, is preferred for edible fruit.