Annual slender plants with strongly dissected leaves and filiform leaf-segments. Flowers regular. Sepals petaloid, blue or whitish, acute, deciduous. Petals nectiferous, 5-10, bilabiate, the outer lips deeply incised. Stamens numerous. Follicles 2-8(-14), more or less coherent, rostrate with long styles, often inflated. Seeds several in each unilocular follicle.