Annual herb 15-35 cm tall; stems erect, the lateral stems often decumbent, 0.8-3.5 mm diam., glabrous to tornentose with hairs 0.3 mm long. Leaves ovate-rhombic (youngest leaves approaching lanceolate), 1.5-6.5 cm long, 1.5-3.5 cm wide, acuminate to obtuse, the base obtuse-attenuate, the upper surface infrequently strigose with hairs 0.6 mm long, the lower surface glabrous, the margin obscurely to coarsely serrate; petioles 4-23 mm long. Inflorescence of solitary heads; peduncles 0.5-5.1 cm long. Heads radiate, 4-5 mm tall, 5-8 mm across; outer involucre cupulate, 5-8 mm diam., the bracts 5, connate '/1-'/ of their length, imbricate, ovate-orbiculate, 3-5 mm long, 2-3.6 mm wide, obtuse, the abaxial surface glabrous, the margin herbaceous, ciliate, with hairs 0.3 mm long; paleas oblong-elliptic, 2 mm long, 0.7 mm wide, apically yellow, the margin erose, the midrib weak, glabrous; ray florets 5-8, the ligules yellow, elliptic, 1-1.5 mm long, 0.5-1 mm wide; disc florets 15-25, the corollas yellow, 1.1 mm diam., the throat and tube 0.5 mm long. Fruits 2.9-3.1 mm long, the sides with diagonal ridges and enlarged margins. Chromosome number n = 25 + 1.
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