Shrubs, 50–200 cm (freely branched, broomlike) . Stems erect, fastigiate, striate-angular, green, glabrous, resinous. Leaves cauline (proximal withering and sparse by flowering); sessile; blades (1-nerved) broadly oblanceolate to obovate or spatulate, 10–35 × 5–15 mm (thick, firm), bases attenuate , margins entire or irregularly serrate (teeth 1–4, distal leaves entire), apices obtuse to acute, faces glabrous, gland-dotted, resinous. Heads (sessile or short-pedunculate on lateral branches) in crowded paniculiform arrays. Involucres funnelform to campanulate; staminate 3–5 mm, pistillate 3–5 mm. Phyllaries ovate to linear-lanceolate, 1–5 mm, margins scarious, erose, medians green, apices rounded to acute, glabrous, gland-dotted, resinous. Staminate florets 24–33; corollas 2–3.5 mm. Pistillate florets 15–30; corollas 1.6–2.7 mm. Cypselae 1–2 mm, prominently 10-nerved, glabrous; pappi 1.7–3.1 mm. 2n = 18.
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