Shrubs, 100–200 cm (openly branched from bases). Stems erect to ascending, slender, striate-angled, glabrous, scarcely resinous. Leaves usually present at flowering; sessile; blades (1-nerved) linear-oblanceolate to narrowly oblong, 20–40(–80) × 4–8 mm, bases cuneate, margins evenly serrate (teeth spinulose, apices acute, faces finely gland-dotted, not resinous). Heads (10–50+ ) in terminal, compact, rounded paniculiform arrays. Involucres campanulate; staminate 3–6 mm, pistillate 3–6 mm. Phyllaries lanceolate, 1–5 mm, margins scarious, erose-ciliate, medians green, apices acute or obtuse (erose, abaxial faces glabrous). Staminate florets 20–30; corollas 3 mm. Pistillate florets 30; corollas 2.2–3 mm. Cypselae 1.5–2.2 mm, 5-nerved, glabrous; pappi 4–6 mm.
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