Sundew, the common name for a family of insect-digesting plants. There are about 100 species in temperate and tropical regions of the world. Most are perennial herbs, found primarily in bogs. Well-known members of the family are the Venus's flytrap and the round-leaved sundew. Both plants are grown as ornamentals.

The round-leaved sundew has a single stalk, 2 to 12 inches (5 to 30 cm) high, that bears white or pink five-petaled flowers. The leaves grow at the base of the stalk in a rosette and are covered with reddish hairs. At the tip of the hairs are glands that secrete a sticky, glistening fluid. An insect landing on a leaf becomes entangled in the hairs, which fold over it. The insect is held to the leaf until its body proteins are digested.

The round-leaved sundew is Drosera rotundifolia of the sundew family, Droseraceae.