Rhynchospermum formosanum Yamam.
Perennial herbs, rhizome very short. Stems erect, rigid, 25-100 cm tall, usually divaricately branched in upper part, minutely puberulous. Leaves 5-15×2.5-4 cm, shallowly undulate-toothed on upper half, short setulose on both surfaces, basal leaves withered at anthesis; lower cauline leaves oblanceolate or oblong-oblanceolate, apex acute, base narrowed to petiole, middle leaves many, densely arranged, lanceolate, acuminate at both ends, gradually smaller upward. Heads 3-4 mm long, 4-5 mm across, solitary or in short racemes or panicles in successive leaf axils. Peduncle 5-15 mm long, pubescent. Involucre broadly campanulate, ca. 2 mm long, 3-4 mm across, bracts in 3-series, subequal,scarious, oblong, obtuse, ca. 1.6 mm long, glabrous, margins thinly membranaceous, ciliate. Ray florets many in 2 or 3 rows, corolla ligulate, rather thick, white, 0.7-1 mm long, glandular dotted, ligules entire or bifid. Disc florets bisexual, corolla yellowish, ca. 1 mm long, glandular dotted, limb campanulate, 5-lobed. Achenes oblanceolate-oblong, flat, 1.8-2×ca. 0.8 mm, glandular dotted. Pappus white, capillary, bristles 1.5 mm long, early deciduous. Fl. Jul-Jan. Chromosome number, 2n = 18 (Peng & Hsu, 1978).
TAIPEI: Peichatienshan, Peng 7469; Sanhsia, Leu 1587. ILAN: Yuanyang Lake, Peng 2037; Nanhutashan, Jeng 1948. TAOYUAN: Lalashan, Peng 14621. HSINCHU: Litungshanchuang, Wang 1976. MIAOLI: Erpensung, Huang 15394. NANTOU: Mayfeng, Peng 9052; Lona, Peng 16994. HUALIEN: Mukuashan, Peng 7318.
Southern Asia, Malaysia, Java, mainland China, the Ryukyus, Japan and Korea. Taiwan, in wet situations in mountains in the northern and central region, 700-2,200 m.