Net-veined Bladderwort is an insectivorous aquatic herb, up to half a meter tall. It has numerous narrowly linear-oblong leaves, 1-2 cm long. The scapes are erect, 15-50 cm, slender and twinning. Flowers appear well-spaced on the upper part of the raceme, with 6-12 mm stalk. The bluish purple flowers are 2-lipped. The larger lip, 1.2-1.6 cm, is net-veined with dark colored veins, and has a light colored center. The conical, straight spur is 6 mm long.