Luffa operculata
 Luffa operculata (common name Sponge Cucumber Wild Loofa or mướp xơ in Vietnamese) is a species of Luffa. It is cultivated for its fruit which when fully ripe is strongly fibrous and is used as a fibrous scrubbing sponge for household cleaning. The fruit is a capsule with spikes. The fruit is dark-brown when mature. It is also grown in gardens and yards as an ornamental plant.