Herbs, perennial or nearly subshrubs, 50-100(-150) cm tall, with thick stock, arachnoid pubescent or glabrescent. Lowermost and middle stem leaves ± sessile, sparsely gray arachnoid pubescent adaxially and densely arachnoid tomentose abaxially. Middle leaves oblong-ovate, 2-5.5 × 1-3.5 cm, 2-pinnatisect; segments 2 or 3(?-5) pairs, 10-20 × 5-15 mm; lobules 1 or 2 pairs, elliptic or elliptic-lanceolate, 3-10 × 1.5-3 mm, obtuse apically; rachis narrowly winged. Uppermost leaves and leaflike bracts 1-or 2-pinnatisect. Synflorescence a narrow or somewhat broad panicle, sometimes quite lax. Involucre oblong or obovoid-oblong, 2-2.5(-3) mm in diam., with obvious leaflike bracts at base; phyllaries gray arachnoid pubescent. Marginal female florets 4-8. Disk florets 10-14, bisexual; corolla purplish or yellow. Achenes obovoid. Fl. and fr. Jul-Oct.
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