Perennial herb, creeping and rooting at the nodes, the flowering stems erect and to 20(–30) cm high; stems hollow, flushed red or purple, pubescent to glabrous. Leaves (sub-)sessile, narrowly oblong, 1–12 cm long, 0.3–1.5 cm wide, base sub-hastate to broadly cuneate, margins entire or serrate, apex acute to obtuse, sparsely pubescent to glabrous, glandular-punctate. Capitula axillary, solitary, urn-shaped; involucre 9–15 mm long; phyllaries 4, in 2 opposite pairs, the outer broadly ovate; paleae 3.2–5.5 mm long, sheathing the disc florets, keeled, ciliate and glandular near apex. Ray florets greenish yellow to lemon yellow or white, tube 1.2–1.8 mm long, rays 0.4–0.7 mm long; disc florets yellow, 2.4–3 mm long. Achenes brown, narrowly oblong, 2.4–3.7 mm long, gland-dotted; pappus absent. Fig. 166 (page 769).
