Herbs, spreading, annual, (0.3-) 0.5-4 dm, essentially glabrous, green or occasionally yellow-green. Stems: caudex absent; aerial flowering stems erect, usually hollow and fistulose, 0.5-1.5 dm, glabrous, villous proximally. Leaves basal; petiole 1-3 cm, hirsute; blade round, 0.5-3 × 0.5-2.5 cm, short-hirsute and greenish on both surfaces, margins plane. Inflorescences cymose, open, spreading, 5-30 × 5-30 cm; branches fistulose, glabrous; bracts 3, scalelike, 1-2 × 1-1.5 mm. Peduncles erect, straight, filiform to capillary, 1-2 cm, glabrous. Involucres turbinate, 1-1.2 × 0.7-1 mm, glabrous; teeth (4-)5, erect, 0.4-0.6 mm. Flowers 1.3-1.6 mm; perianth yellow with greenish to reddish midribs, densely hirsute with coarse curved hairs; tepals monomorphic, ovate; stamens exserted, 1.3-1.8 mm; filaments sparsely pubescent proximally. Achenes light brown, lenticular to 3-gonous, 1.3-1.8(-2) mm, glabrous.
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