Ovary of (3–)5 united carpels, (3–)5-lobed, (3–)5-locular; stigmas 3 or 5, more or less free; ovules 1 per loculus; placentation basal.
Leaves alternate, opposite or verticillate, densely crowded at base of plant, linear or narrowly lanceolate; stipules scarious.
Inflorescence an umbelliform, often glomerate, terminal or axillary cyme; bracts often whorled.
Stamens 5, hypogynous, alternate with the perianth-segments.
Fruit (3–)5-lobed, (3–)5-celled, a loculicidal capsule.
Perennial, often creeping, rosette or cushion herbs.
Flowers hermaphrodite, pedicellate, small.
Perianth-segments 5, herbaceous, free.
Seeds orbicular-reniform, granular.