Brit. Herb., 227, plate 33 [upper center]. 1756.
Herbs, annual, glabrous. Stems erect, branched throughout. Leaves persistent, opposite; stipular glands absent; blade ovate to lanceolate, margins entire. Inflorescences dichasia. Pedicels not articulated. Flowers: sepals persistent, 4, connate at base, equal in size, margins entire, not glandular; petals 4, distinct, attached at rim of filament cup, white, appendages absent; stamens 4; staminodes 0; pistil 4-carpellate, ovary 4-locular; styles 4, distinct; stigmas capitate, wider than styles. Fruits capsules, dehiscing into 4 segments, each partially divided by an incomplete septum. Seeds 8, obovoid to ellipsoid, sometimes flattened on one side. x = 9
Introduced; Europe, sw Asia, Africa, Atlantic Islands (Macaronesia).