Shrubs, 100–300 cm (much branched). Stems ascending, striate-angled, glabrous, smooth or minutely roughened, resinous. Leaves present at flowering (numerous and well developed); short-petiolate; blades (at least broader distinctly 3-nerved) oblong to oblanceolate, 25–70 × 5–10(–20) mm, bases tapering attenuate, margins usually serrate distally (teeth 1–3, coarse irregular, ca. 5 mm apart), sometimes entire, apices acute or obtuse, faces finely gland-dotted. Heads (100–200+, short-pedunculate or sessile) in (large, crowded, leafy) paniculiform arrays. Involucres narrowly obconic to campanulate; staminate 4–7 mm, pistillate 5–9 mm. Phyllaries lanceolate , 2–6 mm, margins scarious, medians green or reddish, apices greenish or purplish, often erose-ciliate, faces glabrous, gland-dotted, resinous . Staminate florets 20–25; corollas 3–5 mm. Pistillate florets 25–30; corollas 3–4 mm. Cypselae 1.2–2 mm, irregularly 8–10-nerved, glabrous; pappi 8–12 mm (elongating in fruit).
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