Herbs, erect to spreading, annual, 2-9 dm, glabrous and sparsely glandular especially (or at least) near nodes, grayish to greenish. Stems: caudex absent; aerial flowering stems erect, solid, not fistulose, 0.5-1.5 dm, glabrous, glandular distally or sparsely so throughout. Leaves basal; petiole 1-4 cm, pilose, slightly winged; blade oblanceolate to obovate, (0.5-)1-4 × 0.5-1.5 cm, sparsely pilose, glandular and greenish on both surfaces, margins entire. Inflorescences cymose, open, 30-80 × 10-50 cm; branches not fistulose, glabrous, sparsely glandular at nodes; bracts 3, scalelike, 1-2 × 1-2 mm. Peduncles deflexed, straight, filiform, (0.1-)0.2-0.35 cm, sparsely glandular. Involucres turbinate, 1.2-1.5 × 1-1.3 mm, glabrous; teeth 4, erect or nearly so, 0.3-0.7 mm. Flowers 1.5-2.5 mm; perianth white with reddish brown midribs, becoming reddish in fruit, rarely yellow, puberulent; tepals monomorphic, oblong-obovate, sometimes with apiculate tip 1-2 mm; stamens exserted, 1.5-2 mm; filaments glabrous. Achenes light brown to brown, lenticular, 1.3-1.7(-2.2) mm, glabrous. 2n = 40.
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