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FOC | Family List | FOC Vol. 20-21 | Asteraceae | Senecio

61. Senecio dubitabilis C. Jeffrey & Y. L. Chen, Kew Bull. 39: 427. 1984.

北千里光 bei qian li guang

Senecio dubius Ledebour, Fl. Altaic. 4: 112. Jul-Dec 1833, not Beck (May-Jun 1833); S. coronopifolius N. L. Burman var. discoideus C. Winkler ex Danguy; S. vulgaris Linnaeus var. dubius Trautvetter.

Herbs, annual. Stems erect, 5-30 cm tall, branching from base or middle; branches erect or spreading, glabrous or sparsely pubescent with long white hairs when young. Leaves sessile; blade spatulate, oblong-lanceolate, oblong, or linear, 3-7 × 0.3-2 cm, lower ones attenuate into a petioloid base, middle ones often ± expanded at base into irregularly toothed subamplexicaul auricles, pinnately shortly lobulate with entire or few-denticulate lobes to remotely dentate or entire, apex obtuse to acute. Upper leaves smaller, lanceolate to linear, margin denticulate or entire. Capitula discoid, few to many, terminal, usually laxly corymbose; peduncles 1.5-4 cm, slender, glabrous or sparsely pubescent, with 1 or 2 linear-lanceolate bracts. Involucres narrowly campanulate, 6-7 × 2.5-5 mm, calyculate; bracts of calyculus 4 or 5, linear-subulate, short, apically acute, sometimes shortly black tipped; phyllaries ca. 15, linear, 0.5-1 mm wide, herbaceous, with narrow membranous margins, glabrous, apically acute, finely shortly bearded and sometimes blackish. Ray florets absent. Disk florets many; corolla yellow, 6-6.5 mm, with 4-4.5 mm tube and cylindric limb; lobes ovate, ca. 0.3 mm. Anthers linear, ca. 1 mm, basally very shortly obtuse-auriculate, appendages ovate-lanceolate; antheropodia dilated toward base. Style branches ca. 0.6 mm. Achenes cylindric, 3-3.5 mm, densely pubescent. Pappus white, 7-7.5 mm. Fl. May-Sep.

Sandy and rocky places, field margins; 2000-4800 m. Gansu, Hebei, Nei Mongol, Qinghai, Shaanxi, Xinjiang, Xizang [NW India, Kashmir, Kyrgyzstan, Mongolia, Pakistan, Russia (E and W Siberia), Tajikistan, Uzbekistan].


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