钻叶紫菀 zuan ye zi wan

Aster subulatus Michaux, Fl. Bor.-Amer. 2: 111. 1803.

Herbs, annual, 16-150 cm tall. Stems erect, sometimes purplish, glabrous, eglandular. Leaves: basal petiolate, lanceolate to ovate, usually fallen at anthesis; cauline petiolate to sessile, lanceolate to linear-lanceolate, 2-11 × 0.1-1.7 cm, slightly reducing in size upward, surfaces glabrous, eglandular, base attenuate to cuneate, margin serrulate to entire, eciliate, apex acute. Capitula radiate, numerous, in paniculiform synflorescences; peduncles 0.3-1 cm, glabrous, eglandular. Involucre cylindric; phyllaries 3-5-seriate, lanceolate to linear-lanceolate, glabrous, strongly unequal, outer 1-2 × ca. 0.2 mm, margin scarious, entire, scabrous, distally ciliate, eglandular, apex acute to acuminate. Ray florets numerous, in 1 series, lamina purplish blue, 1.5-2.5 mm, glabrous, eglandular; disk florets yellow, pinkish with age, 3-3.5 mm, limb 1.4-1.5 mm, lobes erect, triangular, 0.4-0.5 mm, glabrous, eglandular. Achenes lanceoloid, 1.5-2.5 mm, 2-6-veined, sparsely strigillose. Pappus of many white, fine, barbellulate bristles, 4-5 mm. Fl. and fr. Aug-Oct.

Disturbed areas, roadsides, grassy fields, irrigation ditches, rice field margins; near sea level to 2000 m. Introduced in Anhui, Fujian, Guangxi, Guizhou, Hebei, Henan, Hong Kong, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Sichuan, Taiwan, Yunnan, Zhejiang [Africa, Central, North, and South America].