Drosera filiformis, commonly known as the thread-leaved sundew, is a small, insectivorous, rosette-forming species of perennial herb. A species of sundew, it is unusual within its genus in that the long, erect leaves of this plant unroll in spirals.
Drosera filiformis, commonly called dew-thread sundew, is a small, carnivorous, herbaceous perennial native to the Atlantic coastal plains of the United States in small, disjunct populations. It can be found growing along bodies of freshwater, in seepage bogs or fens, moist swales between dunes, and sandy, roadside depressions. Thin, narrow, upright leaves reaching up to 8" long emerge from a basal stem. The leaves are covered in red, gland-tipped hairs that exude a sticky substance to trap and break down insects. The leaves unfurl spirally. Thin flowering scapes up to 10" tall emerge from the base of the rosette in summer, bearing multiple pink to purple, 0.75" diameter flowers. Mature plants will form form offsets and clumps will slowly fill a 1' area in ideal conditions.