Plants grayish green. Stem erect, 35-110(-180) cm tall, 8-15 mm in diam. at base, proximally glabrous, distally and synflorescence shortly pilose. Basal leaves petiolate; petiole often purplish red, 5-20 cm, glabrous, narrowly winged, base sheathed; leaf blade ovate-oblong or oblong, 6-16(-45) × 4.5-9(-28) cm, glabrous, pinnately veined, base cuneate, narrowed into a petiole, margin undulately denticulate, apex obtuse. Stem leaves sessile, erect, ovate-oblong to lanceolate, to 12 × 5 cm, tubular-amplexicaul or semiamplexicaul at base. Synflorescence paniculate, 5-40 cm, proximally branched; leaflike and supplementary bracts linear-subulate, 3-8 mm; peduncles 1-3 mm, slender. Capitula numerous. Involucre narrowly turbinate or cylindric, 3.5-5(-6) × 2-3(-5) mm or mouth to 6 mm in diam., outside glabrous or white puberulent; phyllaries 4 or 5, in 2 rows, obovate or oblong, 1.5-3 mm wide, apex obtuse or rounded; inner phyllaries membranous at margin. Ray florets 1-3, yellow; lamina oblong, 6-8 × 2-3 mm, apex rounded; tube ca. 4 mm. Tubular florets 2-7, extending from involucre, 5-7 mm; tube 2-2.5 mm. Achenes yellowish, cylindric, 3-6 mm. Pappus white, as long as tubular corolla. Fl. and fr. Jun-Aug. 2n = 58.
Home