Perennials, 30–95 cm (taproots thickened). Stems branched, puberulent. Leaves opposite or alternate; petioles 10–70 mm; blades 3-nerved from bases, deltate-ovate, lance-ovate, or subcordate, 15–120 × 20–70 mm, bases acute, truncate, or subcordate, margins crenate, dentate, or serrate, apices attenuate, faces puberulent and gland-dotted. Heads (nodding in flower and fruit) in loose, corymbiform or paniculiform arrays. Peduncles 4–30 mm, pubescent. Involucres cylindric or obconic, 7–12 mm. Phyllaries 30–40 in 5–7 series, greenish, 4–5-striate, unequal, margins scarious; outer lance-ovate to lanceolate (pubescent, margins ciliate, apices long-acuminate), inner lanceolate to lance-linear (glabrous, apices acute to acuminate). Florets mostly 20–40(–70); corollas pale yellow-green, 6.5–7.5 mm. Cypselae 4–5 mm, hispidulous to hirtellous; pappi of 20–30 white, barbellate bristles. 2n = 18.
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A western sp. with deltoid or cordate lvs and merely barbellate pappus, extends e. to s. and c. Mo., and may prove to occur in our range. It would key to Kuhnia.
Rocky hillsides, shaded forests, dry slopes, canyons; at elevations from 1,200-3,000 metres.
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