Jacobaea ambracea (Turczaninow ex Candolle) B. Nordenstam; Senecio ambraceus var. glaber Kitamura; S. manshuricus Kitamura.

Herbs, perennial, rhizomatous. Stem solitary, erect, 45-100 cm tall, sparsely arachnoid-pubescent or subglabrous, simple, branching into synflorescence. Basal leaves mostly withered by anthesis, petiolate; blade obovate, margin serrate-dentate, usually lyrate-pinnately lobulate in lower part, apex obtuse. Lower stem leaves petiolate; blade obovate-oblong, 6-12 × to 4 cm, papery, abaxially sparsely minutely pubescent or glabrous, adaxially glabrous, apex obtuse, margin deeply pinnatisect, with indistinct terminal lobe and 10-16 oblong, irregularly dentate or lobulate lateral lobes. Median stem leaves sessile, basally usually laciniate-auriculate, deeply pinnatisect or pinnatipartite, with oblong-linear, obtuse to acute, dentate to deeply lobulate spreading or ascending lateral lobes. Upper leaves smaller, pinnately lobed, coarsely dentate, or linear and subentire. Capitula radiate, few to rather numerous, arranged in a usually rather spreading terminal compound corymb; peduncles 1.5-6 cm, erect or ascending, sparsely arachnoid-pubescent, glabrescent, bracteate, with a few linear or linear-subulate, 3-5 mm bracteoles. Involucres broadly campanulate to hemispheric, 7-8 × 6-10 mm, calyculate; bracts of calyculus 2-6, linear; phyllaries 13-15, narrowly oblong, 7-8 × 1-2 mm, herbaceous, glabrous, margin narrowly scarious, apically acuminate and bearded. Ray florets 13 or 14; corolla tube ca. 4.5 mm; lamina oblong, ca. 12 × 3-3.5 mm, 4-veined, apically obtuse, 3-denticulate. Disk florets many; corolla yellow, ca. 6 mm, with ca. 2.5 mm tube and funnelform limb; lobes ovate-triangular, ca. 0.7 mm, apically acute, papillose. Anthers ca. 1.8 mm, basally auriculate, appendages ovate-lanceolate; antheropodia distinctly dilated toward base. Style branches ca. 1 mm. Achenes cylindric, ca. 3 mm, glabrous in ray florets, sparsely pubescent in disk florets, rarely all glabrous. Pappus whitish, ca. 6 mm, present in all florets. Fl. Aug-Sep, fr. Sep-Oct.

Grassy places, forest margins; 500-1400 m. Gansu, Hebei, Heilongjiang, Henan, Jilin, Liaoning, Nei Mongol, Shaanxi, Shandong [Korea, Mongolia, Russia (Altai, Far East, E Siberia)].