Herbs, annual; taprooted. Stems decumbent, ascending, or erect, glabrous. Leaves cauline, alternate or subopposite, petiolate; ocrea persistent, chartaceous; blade spatulate-ovate to orbiculate, margins entire. Inflorescences terminal, paniclelike or cymelike, not pedunculate. Pedicels absent or present. Flowers bisexual, 3-10 per ocreate fascicle, bases not stipelike; perianth nonaccrescent, greenish, often tinged white or pink distally, narrowly campanulate, glabrous or occasionally with scattered glands; tepals 3 [4], distinct, sepaloid, monomorphic; stamens (1-)3[-5]; filaments distinct, free, glabrous; anthers white or yellowish, ovate to elliptic; styles 2(-3), erect, distinct; stigmas capitate. Achenes included or barely exserted, light brown or brown to black, unwinged, unevenly 2-gonous, rarely 3-gonous, glabrous. Seeds: embryo curved. x = 7.
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Herbs annual. Stems slender, branched. Leaves petiolate, subopposite; ocrea membranous. Inflorescence paniculate. Flowers bisexual. Perianth 3(-5)-parted. Stamens 3, alternate with tepals and 3 glandlike staminoids. Ovary ovoid, compressed; styles 2, persistent, very short; stigmas capitate. Achenes narrowly ovoid, biconvex.
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