Rigid, 30–80 cm high, perennial herb with extensive roots and creeping rhizomes. Branches terete, cobwebby-canescent, becoming glabrous with age. Leaves rigid, sessile, amplexicaul, lanceolate to ovate, (4–) 5–10 cm long, 2–4 cm wide, deeply pinnatifid to pinnatisect with triangular or lanceolate to subulate, apically stiff spiny lobes, revolute-margined, bluish green and almost glabrous above, densely white-hairy beneath. Capitula 5–10 mm across, several in terminal and axillary corymbose clusters; involucre 3–4-seriate; bracts herbaceous, ovate-triangular or ovate-lanceolate, 8–12 (–15) mm long, concave, patent, spiny-margined; outermost ±tomentose; receptacle pitted; paleae deeply lacerate, 1 (–2) mm long. Ray florets absent. Disc florets 30–40, yellow; corolla tubular, 5-lobed. Achenes turbinate, 1.5–2.5 (–3) mm long, glabrous or sparsely short-hairy, persistent. Pappus scales oblong-rotund, c. 0.2 mm long, fused into a crown, obtuse.
Glabrescent to white-woolly perennial to 1 m. Leaves deeply pinnatifid, lobes narrow, margins revolute, spiny. Flower heads discoid, yellow, several terminal on lateral branches.