Vegetative key to the families

INSECTIVEROUS PLANTS with either sticky glands on the leaves (Fig.28), or with bladders 1–2 mm long on submerged or subterranean leaves (Fig. 28). Very delicate herbs
Leaves (subterranean or in water) with bladders 1–2 mm long (Fig. 24) Lentibulariaceae
Floating aquatic plants. Flowers on axillary peduncles. Corolla yellow. Leaves submerged, divided into capillary segments interspersed with bladder-traps
Swamp plants, submerged or exposed or growing on wet ground. Flowers on erect scapes with or without scale leaves. Corolla blue to purple or white. Leaves basal, linear to linear-spathulate or ovate, often minute, usually absent at flowering time