46. Parasenecio dasythyrsus (Handel-Mazzetti) Y. L. Chen, Fl. Reipubl. Popularis Sin. 77(1): 78. 1999.
山西蟹甲草 shan xi xie jia cao
Cacalia dasythyrsa Handel-Mazzetti, Acta Horti Gothob. 12: 296. 1938; Koyamacalia dasythyrsa (Handel-Mazzetti) H. Robinson & Brettell.
Plants 65-90 cm tall. Rhizomes procumbent, with fibrous roots. Stem solitary, straight or slightly curved, striate, long naked, articulate, glandular pubescent or subglabrous in lower part, arachnoid or shortly glandular hairy in upper part. Lower leaves often fallen by anthesis. Median leaves crowded, long petiolate; petiole 7-14 cm, not winged, glandular hairy; blade abaxially pale green, adaxially dark green, broadly ovate-cordate or cordate, 10-15 × 13-20 cm, thinly papery, palmately 7-veined, lateral veins furcately branched, abaxially sparsely arachnoid and glandular hairy, adaxially brown strigillose, base cordate, rarely subtruncate, basal margin with deeply undulate stout teeth, teeth mucronulate, apex acute or slightly obtuse. Upper leaves shortly petiolate, very small. Capitula many, apically in dense or lax narrow panicles; peduncles 3-4 mm, with 1-3 linear bractlets at base; rachis and peduncles arachnoid and glandular hairy; capitula spreading, pendulous later, arachnoid and glandular hairy. Involucres narrowly campanulate or cylindric; phyllaries 4 or 5, pale green and nitid, broadly linear-lanceolate, 10-12 × 1.5-2 mm, sparsely glandular hairy, margin narrowly scarious, apex slightly acute or obtuse. Florets 5 or 6; corolla orange, exserted from involucre; tube slender, as long as limb, or rather short; limb narrowly campanulate; lobes lanceolate, ca. 3 mm. Anthers exserted from corolla, basally long caudate. Style branches excurved, apically truncate, penicillate, papillose. Achenes cylindric, 2-3 mm (immature), glabrous. Pappus white, as long as corolla. Fl. and fr. Aug-Sep.
● Grasslands on slopes; 700-1200 m. Gansu, Shaanxi, Shanxi.
Parasenecio dasythyrsus is similar to P. rufipilis in aspect but differs by its articulate glandular hairs, orange florets, and longer peduncles.