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Perennials or subshrubs, 50–130(–170) cm (not cespitose), aromatic (roots thick, woody). Stems relatively numerous, erect, brown, branched, (woody, brittle), glabrous or sparsely hairy. Leaves cauline, dark green; blades broadly ovate, (2–)3–6 × 0.02–0.15 cm, 2–3-pinnatifid (lobes linear or filiform), faces sparsely hairy (abaxial) or glabrous (adaxial). Heads (nodding at maturity) in open, widely branched arrays 10–30 × 2–10 cm. Involucres ovoid, (1–)2–3.5 × (1–)2–2.5 mm. Phyllaries oblong-elliptic, sparsely hairy. Florets: pistillate 4–8(–15); bisexual 14–16(–20); corollas yellow, 0.5–1 mm, glandular. Cypselae (light brown) ellipsoid (2–5-angled, flattened, furrowed), 0.5–1 mm, glabrous. 2n = 18.


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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA

Source: Missouri Botanical Garden

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