Annual, herbs, stem erect or ascending, to 30 cm or more tall, branched, rarely rooting at nodes. Leaves opposite, petiole 1–2 cm long; lamina narrowly ovate to ovate–lanceolate, 2–4 cm long, 1–2.5 cm wide, 3–veined, base cuneate, margins entire or serrate, acute. Capitula discoid, solitary, terminal, subglobose to conical, 6–9 mm across, peduncles 2.5–16 cm long, sparsely pilose. Phyllaries 9–12, biseriate, ovate–lanceolate, ca. 6 mm long, herbaceous, glabrous. Receptacle 5–8 mm long, 1–3 mm in diameter, acuminate. Ray florets absent, disc florets 90–200, bisexual, corollas yellow, tubular, minute, usually bulbous at base, 4 or 5–lobed, densely pilose inside. Style glabrous, stigma densely papillose. Cypselas black, obovoid, 3–angled, ca. 3 mm long, margins scabrid, apex slightly depressed, pappus of 2 subequal bristles.