Herbs, annual; taproot slender. Stems arising directly from the root, spreading to decumbent or prostrate, solid, not fistulose or disarticulating into ringlike segments, glabrous or sparsely pubescent. Leaves quickly deciduous, basal and cauline, in whorls of 3; petiole present only at proximal nodes; blade oblong to broadly elliptic or obovate, margins entire. Inflorescences terminal, cymose; branches mostly dichotomous, not brittle or disarticulating into segments, round, glabrous or sparsely pubescent; bracts absent. Peduncles absent. Involucral bracts absent. Flowers 3-9 per node at any single time during full anthesis; perianth yellow, broadly campanulate when open, narrowly urceolate when closed, thinly pubescent abaxially; tepals 6, connate proximally, monomorphic, entire apically; stamens 9; filaments basally adnate, pilose basally; anthers yellow, ovate. Achenes included, brown, not winged, 3-gonous, glabrous. Seeds: embryo curved.
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