台东狗舌草 tai dong gou she cao

Senecio taitoensis Hayata, J. Coll. Sci. Imp. Univ. Tokyo 30(1): 156. 1911; S. pierotii Miquel var. taitoensis (Hayata) Kitamura; S. subdentatus Ledebour var. taitoensis (Hayata) Cufodontis.

Herbs, rhizomatous. Stem solitary, erect, 30-60 cm tall, simple, sparsely arachnoid to subglabrous. Radical leaves few, usually present at anthesis, rosulate; petiole 3-6 cm, winged, basally expanded; blade ovate-oblong or broadly oblong, 9-15 × 4.5-6.5 cm, thinly papery, glabrous, base cuneate-attenuate into petiole, margin irregularly repand-dentate to subentire, apex obtuse to rounded, apiculate. Stem leaves few, progressively smaller upward; lower leaves shortly petiolate, oblong or oblanceolate-oblong, basally subamplexicaul; upper leaves sessile, ovate-lanceolate or lanceolate, margin few dentate or entire, apically obtuse to subacute; uppermost leaves small, bractlike. Capitula 2.5-3 cm in diam., 8-12 arranged in terminal subumbelliform simple or compound corymbs; peduncles 1.5-4 cm, slender, pubescent, basally bracteate, not bracteolate; bracts linear-subulate. Involucres campanulate, 6-7 × 6-8 mm, not calyculate; phyllaries 20-22, lanceolate or linear-lanceolate, 0.8-1 mm wide, herbaceous, with narrow membranous margin, glabrous, apex acuminate. Ray florets 13-15; corolla tube ca. 7 mm; lamina yellow, ca. 12 × 2.5 mm, 4-veined, apically 3-denticulate, obtuse. Disk florets: corolla yellow, 11-12 mm, with 8-8.5 mm tube and funnelform limb; lobes ovate-oblong, ca. 1 mm, apically acute, papillose. Anthers ca. 1.5 mm, basally obtuse, appendages ovate-lanceolate. Style branches ca. 0.5 mm. Achenes cylindric, 2-2.5 mm, glabrous. Pappus white, 10-11 mm. Fl. Mar-Apr.

● Marshes. Taiwan.