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Annual hydrophytic herbs. Stems somewhat succulent, with large vertical air-passages in the cortex. Leaves alternate, simple, entire; stipules absent. Inflorescence a dense terminal or leaf-apposed spike; small bracts subtending each flower; bracteoles 2. Flowers bisexual, actinomorphic. Sepals 5, fused, lobes imbricate. Petals 5, fused, urceolate-campanulate, lobes imbricate, caducous. Stamens 5, alternate to corolla lobes; filaments attached to base of corolla tube; anthers tetrasporangiate and dithecal, opening by longitudinal slits. Gynoecium of 2 carpels, united; ovary semi-inferior or inferior, bilocular; ovules numerous on large spongy axile placentas; styles lacking or very short; stigma capitate or obscurely 4-lobed, lacking collecting hairs. Fruit a capsule, membranous, circumscissile. Seeds many, small; embryo straight; endosperm more or less absent.
Herbs annual, without latex. Leaves alternate, simple. Inflorescence a dense terminal or leaf-opposed spike, bracteate and bracteolate. Flowers sessile, bisexual, actinomorphic. Calyx epigynous, 5-lobed. Corolla epigynous, tubular, 5-lobed to middle. Stamens 5, inserted at proximal part of corolla tube, alternate with corolla lobes; filament extremely short; anther 2-celled. Ovary inferior, 2-loculed; ovules numerous, anatropous; placentation axile; stigma obscurely 2-lobed, lobes subcapitate. Fruit a capsule, oblate, circumscissile. Seeds numerous, oblong.
Ovary semi–inferior, 2–locular, with numerous anatropous ovules on large stipitate axile placentas; style short, glabrous, with a capitate slightly 2–lobed stigma
Stamens 5, inserted on the corolla–tube, alternating with the petals; filaments very short; anthers rounded, 2–celled, dehiscing longitudinally
Stamens 5, epipetalous, alternating with corolla-lobes; filaments short; anthers rounded, 2-locular, dehiscing longitudinally
Seeds numerous, minute; testa irregularly plicate–costate; endosperm scanty or absent
Calyx–tube adnate to the ovary; lobes 5, quincuncial, shortly connate, persistent
Fruit a circurnscissile capsule, obovate–obconic, 2–locular, membranous
Corolla campanulate–urceolate, epigynous, caducous; lobes 5, imbricate
Flowers subtended by a bract and two bracteoles, bisexual, regular
Flowers bisexual, regular, subtended by a bract and 2 bracteoies
Stems erect or decumbent, with aerenchymous tissue at the base
Corolla campanulate-urceolate, perigynous, lobes 5, imbricate
Ovary semi-inferior, 2-locular; style short, stigma capitate
Fruit a capsule, circumscissile, seeds numerous, minute
Leaves spirally arranged, simple, entire, exstipulate
Inflorescences terminal, densely spicate, acropetal
Leaves alternate, simple, entire, exstipulate
Inflorescences terminal, dense, spicate
Calyx-tube adnate to the ovary, lobes 5
Annual glabrous helophytic herbs
Annual herbs
