33. Parasenecio roborowskii (Maximowicz) Y. L. Chen, Fl. Reipubl. Popularis Sin. 77(1): 65. 1999.
蛛毛蟹甲草 zhu mao xie jia cao
Senecio roborowskii Maximowicz, Bull. Acad. Imp. Sci. Saint-Pétersbourg 27: 487. 1882; Cacalia adenocauloides Handel-Mazzetti; C. monantha (Diels) Hayata; C. roborowskii (Maximowicz) Y. Ling; C. tatsienensis (Bureau & Franchet) Handel-Mazzetti; Koyamacalia roborowskii (Maximowicz) H. Robinson & Brettell; Parasenecio monanthus (Diels) C. I Peng & S. W. Chung; S. monanthus Diels; S. tatsienensis Bureau & Franchet.
Rhizomes robust, procumbent, with many fibrous roots. Stem solitary, erect, striate, 60-100 cm tall, simple, usually white arachnoid or later glabrescent. Petiole not winged, 6-10 cm, sparsely arachnoid; leaf blade adaxially green, narrowly triangular, 8-13 × 8-10 cm, rachis sparsely shortly hairy or subglabrous, abaxially white or gray-white arachnoid, basally 5-veined, lateral veins furcately branched, prominent on both surfaces, margin irregularly serrate, teeth mucronulate, apex acute or acuminate. Upper leaves smaller, similar to median leaves or narrowly ovate or narrowly triangular, but with short petioles. Capitula numerous, usually terminal or in upper leaf axils, arranged in pyramidal lax panicles on one side, spreading pendulous; peduncles ca. 3 mm, same as rachis arachnoid and shortly pubescent, with 2 or 3 linear or linear-lanceolate bractlets. Involucres cylindric, 8-13 × 1-1.5 mm; phyllaries 3(or 4), rarely 2, yellow-green, linear-oblong, glabrous, few finely veined, margin narrowly scarious, apically obtuse, puberulent. Florets usually 3 or 4, rarely 1 or 2; corolla white, 8-10 mm, with slender tube and ca. 3 mm broadly tubular limb; lobes lanceolate. Anthers exserted from corolla, basally caudate. Style branches excurved, truncate, papillose. Achenes cylindric, 3-4 mm, glabrous, ribbed. Pappus white, 7-8 mm. Fl. Jul-Aug, fr. Sep-Oct.
● Understories of forests on slopes, forest margins, thickets, grasslands; 1700-3400 m. Gansu, Qinghai, Shaanxi, Sichuan, E Yunnan.