Shrubs, 30–100 cm (branched from bases). Stems erect to ascending, slender, striate-angled, glabrous, resinous. Leaves present at flowering; short-petiolate; blades (1-or obscurely 3-nerved) obovate to oblanceolate, 20–35 × 3–15 mm, distally reduced and narrowed, bases cuneate, margins irregularly incised to coarsely serrate or 2-serrate, faces glabrous, gland-dotted, resinous. Heads (20–50) in corymbiform arrays. Involucres campanulate; staminate 4–5 mm, pistillate 4–5 mm. Phyllaries lanceolate, 1–4 mm, margins scarious, medians green, apices acute, erose. Staminate florets 15–20; corollas 3.5–4 mm. Pistillate florets 25–30; corollas 2–2.6 mm. Cypselae 1.5–2.2 mm, 5-nerved, glabrous; pappi 3–4.5 mm.
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