Erect herbs, 20–90 cm tall, much branched, with thinly to sparsely hairy, striate-ribbed stems. Leaves with petiole to c. 1 cm long; lamina rhombic to ovate-elliptic, 1.5–10 cm long, 1–5 cm wide, cuneate or ±decurrent, coarsely serrate or subentire, acute to subobtuse, adaxially sparsely sericeous, abaxially glandular, densely silky-hairy. Capitula 75–100-flowered, aggregated in dichotomously branched panicles; peduncles to c. 1 cm long; involucre hemispherical to depressed subglobose, 5–10 mm wide; outer bracts lanceolate, 3–4 mm long; inner bracts 6–7 mm long, broadly pellucid-margined, acuminate, purple-tipped, thinly grey-pubescent. Florets violet; corolla 4–5 mm long, lobes lanceolate, acute; anthers and style branches violet to white. Achenes obovoid-obloid, 1.25–1.5 mm long, 4-or 5-ribbed, pale-brown, glabrous, glandular. Pappus uniseriate; bristles 8–10, stiff, white, caducous.
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A herb. It is a plant that grows each year from seeds. It grows 1-2 m tall. The stems are ribbed. The stems and leaves have T-shaped hairs. The leaves are 3-10 cm long by 2-5 cm wide. There can be teeth along the edge.
Like Cyanthillium cinereum, C. patula is a medicinal plant and its many uses include reducing fever and treating malaria, stomach and digestive tract disorders, common colds and headaches (Z.Y. Wu et al. (eds), Fl. China 20–21: 366 (2011)).
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