Diodia

Annual or perennial herbs, often diffusely branched with slender, angled branches. Leaves sessile or subsessile; blades linear to ovate; stipules with 3-6 setose lobes and sheathing at base. Flowers axillary, small, solitary or verticillate. Calyx 2-4-lobed with lobes persistent, or disepalous; tube ovoid to obovoid. Corolla usually 4-lobed, white; lobes short, valvate; tube funnel-shaped, membranous. Stamens usually 4, arising in throat of corolla tube, exserted; anthers dorsifixed. Ovary usually 2-locular, with 1 ovule in each locule attached at +/- middle of septum; style slender, exserted, bidentate at apex; stigma subcapitate. Fruit separating into indehiscent mericarps, with pericarp not adnate to seed. x = 7 (polyploidy).