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

53. Senecio wightii (Candolle) Bentham ex C. B. Clarke, Compos. Ind. 197. 1876.

岩生千里光 yan sheng qian li guang

Doronicum wightii Candolle in Wight, Contr. Bot. India, 23. 1834; Madaractis glabra Candolle; Senecio camptodontus Franchet; S. gentilianus Vaniot; S. saxatilis Wallich ex Candolle.

Herbs, perennial, with slender rhizomes. Stem solitary, erect or ascending, 60-120 cm tall, simple or branched, glabrous or nearly so, rather slender. Basal leaves withered by anthesis; stem leaves 5-10 × 0.5-1.5 cm; lower leaves elliptic to linear, cuneate or attenuate into a petioloid base; median leaves narrowly oblong or oblong-lanceolate to linear, somewhat attenuate into a slightly expanded subamplexicaul sessile base; all papery, abaxially pubescent on veins to glabrous, adaxially sparsely shortly adpressed pilose to glabrous, pinnately veined, lateral veins 12-14, margin obscurely and remotely to evidently and coarsely acutely callose-dentate or serrate; upper leaves smaller. Capitula radiate, rather few in lax terminal corymbs; peduncles 0.5-2 cm, slender, sparsely pubescent, bracteate, with 2 or 3 linear-subulate, 2-3 mm, acute bracteoles. Involucres hemispheric, 3-4 × 3.5-4 mm, laxly calyculate; bracts of calyculus 3-5, subulate; phyllaries 20-22, green or purplish, oblong-linear, 0.5-1 mm wide, sparsely pubescent or glabrous, strongly 3-veined, apically acuminate and acute. Ray florets 11-13; corolla tube ca. 1 mm, sparsely shortly pilose in distal part; lamina yellow, oblong, 7-8 × ca. 2.2 mm, 4-veined, apically obtuse, 3-denticulate. Disk florets many; corolla yellow, ca. 3.5 mm, with ca. 1.5 mm tube; lobes ovate-oblong, ca. 0.7 mm, apically acute, papillose. Anthers ca. 1 mm, basally obtuse-auriculate, appendages ovate; antheropodia rather slender, basally moderately dilated. Style branches ca. 0.5 mm. Achenes cylindric, ca. 2 mm, glabrous. Pappus straw-colored, ca. 3 mm, absent in ray florets. Fl. Aug-Nov. 2n = 20.

Wet places, by streams and ponds, roadsides; 1100-3000 m. Guizhou, Sichuan, Yunnan [Bhutan, India, Myanmar, Thailand].


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