翼茎草 yi jing cao

Conyza redolens Willdenow, Sp. Pl. 3: 1915. 1803; Tessaria redolens (Willdenow) Lessing.

Herbs, up to 1 m tall. Stems and branches winged, branched, lanate. Middle leaves sessile, obovate or obovate-oblong, 4-6 × 1.5-2 cm, both surfaces lanate, more densely so on abaxial surface, base decurrent, margin serrulate, apex obtuse; costa adaxially prominent, lateral veins 5-10 pairs, inconspicuous; upper leaves sessile, smaller, narrowly oblong or ovate-oblong, 15-25 × 4-6 mm, base gradually narrower, margin undulate, inconspicuously serrulate, apex acute or obtuse. Capitula 1.5-2 mm in diam., 2-7 in spikes 2-9 cm. Involucre campanulate, ca. 4 mm; phyllaries in 4 or 5 series, apex purplish red, outer ones spatulate or ovate-oblong, ca. 3 mm, abaxially densely lanate, apex 1-3-dentate or obtuse, middle narrowly oblong or linear, 3-3.5 mm, dry membranous, apex abaxially pubescent or glabrous, apex sometimes fimbriate, innermost linear or filiform, ca. 4 mm, glabrous, apex acute or acuminate. Marginal florets in numerous series, filiform, apex 3-dentate or truncate. Central florets 1 to several, tubular, 3-4 mm; limbs 5-dentate or rarely 6- or 7-dentate. Achenes ca. 0.5 mm, ribbed. Pappus in 1 series, white, ca. 3 mm, connate at base. Fl. Dec-Apr.

Waste fields; low elevations. Hainan [India, Indonesia, Laos, Philippines, Vietnam; Australia].