Leaves opposite but usually arranged in false whorls, subsessile, obovate to narrowly oblanceolate, entire; stipules scarious.
Annual or perennial herbs with a sparse indumentum of branched hairs; stems erect or diffuse.
Ovary with numerous ovules; style with 5 stigmatic arms.
Petals 5–8, hyaline, much shorter than the sepals.
Flowers several-? in loose or compact cymes.
Sepals 9–13, spirally arranged, imbricate.
Stamens 5–8, alternating with the petals.
Capsule 5-valved.
Seeds numerous.