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Small annual or perennial herbs. Stems richly branched from the base. Leaves opposite, small or pseudo-verticillate. Stipules scarious. Inflorescence in dense or loose cymes. Flowers small. Bracts small, scarious. Sepals 5, free, green, carinate with scarious margin. Petals 5 or fewer, shorter than sepals. Stamens 5 or fewer, opposite to the sepals; minute staminodes sometimes present; filaments ± united at the base. Ovary unilocular; ovules few to many. Style with 3-lobed stigma. Capsule shorter than sepals, splitting almost to base into 3 spirally twisting valves. Seeds ovoid to lenticular.
Herbs, annual (or rarely biennial); stems, leaves and sepals almost glabrous to cobwebbed. Leaves opposite or pseudoverticillate; stipules scarious, not connate around the node; bracts scarious. Flowers in terminal dichasial cymes, 5-merous, bisexual. Sepals 5, free, or connate only at the base, carinate, ± cucullate. Petals 5, white, narrow, emarginate, shorter than sepals. Stamens (1–) 3–5. Ovary 1-celled, with several ovules; style 1, trifid above. Capsule broadly ovoid, splitting almost to the base along 3 valves. Seeds several, angular-reniform, finely but bluntly papillose-tuberculate.
Herbs annual or perennial. Stems diffuse or erect, usually branched. Leaves opposite, sometimes apparently verticillate, sessile or indistinctly petiolate; leaf blade obovate or spatulate; stipules membranous. Inflorescence a cymose cluster, axillary or terminal; bracts scarious. Flowers small. Sepals 5, margin hyaline, midvein raised abaxially into rounded fleshy keel. Petals often fewer than 5, hyaline, less than 1/2 as long as sepals. Stamens 3--5; filaments ± united at base. Ovary 1-loculed with numerous ovules; style short, 3-lobed. Fruit a capsule, 3-valved, several seeded.
Small annual to perennial herbs. Hairs simple or 0. Lvs opposite or appearing whorled, obovate to orbicular. Stipules scarious. Infl. a terminal dichasium; bracts scarious; epicalyx 0. Sepals 5, free, keeled and hooded. Petals 5, white, < sepals, entire; coronal scales 0. Stamens (1)-3-5. Styles 3, united at base. Fr. an ovoid capsule, dehiscing by 3 deep valves; carpophore 0. Seeds numerous, small, smooth to tuberculate, not winged.
Annual or perennial herbs. Leaves often apparently verticillate and with membranous stipules. Flowers small, in cymes terminating the numerous branches. Sepals keeled. Petals up to 5, entire or emarginate, shorter than the sepals. Stamens 3–5. Ovary unilocular, with numerous ovules; style with three stigmatic branches. Capsule 3-valved.
Petals up to 5, or occasionally absent, entire or emarginate, much shorter than the sepals.
Ovary 1-locular, multiovulate; style short with 3 stigmatic arms.
Flowers small in axillary or terminal cymes; bracts membranous.
Leaves opposite, often in false whorls; stipules membranous.
Sepals 5, with a broad green keel and membranous margins.
Annual or perennial herbs.
Capsule 3-valved.
Stamens 3–5.
Seeds many.
