中文名（Chinese Name）：一年蓬
学名（Scientific Name）：Erigeron annuus (L.) Pers. 
英文名（English Common Name）：eastern daisy fleabane
别名（Chinese Common Name）：千层塔、野蒿
异名（Synonym）：Aster annuus L.  Phalacroloma annuum (L.) Dumort.  Aster stenactis E.H.L.Krause  Doronicum bellidiflorum Schrank
科属（Family & Genus）：菊科（Compositae）飞蓬属
形态特征（Description）：一年生或二年生草本，茎粗壮，高30-100厘米，基部径6毫米，直立，上部有分枝，绿色，下部被开展的长硬毛，上部被较密的上弯的短硬毛。基部叶花期枯萎，长圆形或宽卵形，少有近圆形，长4-17厘米，宽1.5-4厘米，或更宽，顶端尖或钝，基部狭成具翅的长柄，边缘具粗齿，下部叶与基部叶同形，但叶柄较短，中部和上部叶较小，长圆状披针形或披针形，长1-9厘米，宽0.5-2厘米，顶端尖，具短柄或无柄，边缘有不规则的齿或近全缘，最上部叶线形，全部叶边缘被短硬毛，两面被疏短硬毛，或有时近无毛。头状花序数个或多数，排列成疏圆锥花序，长6-8毫米，宽10-15毫米，总苞半球形，总苞片3层，草质，披针形，长3-5毫米，宽0.5-1毫米，近等长或外层稍短，淡绿色或多少褐色，背面密被腺毛和疏长节毛；外围的雌花舌状，2层，长6-8毫米，管部长1-1.5毫米，上部被疏微毛，舌片平展，白色，或有时淡天蓝色，线形，宽0.6毫米，顶端具2小齿，花柱分枝线形；中央的两性花管状，黄色，管部长约0.5毫米，檐部近倒锥形，裂片无毛；瘦果披针形，长约1.2毫米，扁压，被疏贴柔毛；冠毛异形，雌花的冠毛极短，膜片状连成小冠，两性花的冠毛2层，外层鳞片状，内层为10-15条长约2毫米的刚毛。花期6-9月。
分布（Distribution）：原产北美，在我国已归化，常生于路边旷野或山坡荒地中。
用途（Use）：全草可入药，有治疟的良效。
引自中国植物志英文版 FOC Vol. 20-21 Page 644, 645
Erigeron annuus (Linnaeus) Persoon, Syn. Pl. 2: 431. 1807.
一年蓬 yi nian peng| Asteraceae  | Erigeron
Aster annuus Linnaeus, Sp. Pl. 2: 875. 1753; Erigeron heterophyllus Muhlenberg ex Willdenow; Stenactis annua (Linnaeus) Cassini ex Lessing.
Herbs, annual, [10-]30-100[-150] cm tall. Stems erect, branched in upper part, sparsely hispid, strigose above (hairs spreading). Leaves: surfaces strigose-hirsute or sometimes glabrate, eglandular; basal withered at anthesis, winged petiolate, blade elliptic or broadly ovate, rarely spatulate, 4-17 × 1.5-4 cm or more, base attenuate, margin coarsely serrate, scabrous, apex acute or obtuse; lower cauline similar, shortly petiolate, mid and upper shortly petiolate or sessile, blade oblong-lanceolate or lanceolate, 1-9 × [0.3-]0.5-2 cm, margin irregularly serrate to subentire, apex acute, uppermost linear. Capitula 5-50+, in loose paniculiform or corymbiform synflorescences, 6-8 × 10-15 mm. Involucre hemispheric; phyllaries 2- or 3(or 4)-seriate, greenish or ± brownish, abaxially sparsely hirsute, minutely glandular, subequal or outer shorter, lanceolate, 3-5 × 0.5-1 mm, herbaceous. Ray florets 80-125, 2-seriate, [4-]6-8[-10] mm, tube 1-1.5 mm, sparsely hairy above, lamina white or sometimes bluish, linear, ca. 5 × 0.6 mm, flat, tardily coiling; disk florets yellow, 2-2.8 mm, sparsely hairy, lobes glabrous. Achenes lanceolate, flattened, [0.8-]1.2 mm, sparsely strigillose. Pappus 2-seriate, outer of scales or setae, inner absent in ray florets, in disk florets of [8-]10-15 long bristles. Fl. Jun-Sep.
Wastelands, roadsides; sea level to 1100 m. Naturalized in Anhui, Fujian, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Shandong, Sichuan, Xizang [native to E North America; widely introduced worldwide].
This species is spreading in China and is probably more widespread than shown here.（责任编辑：徐晔春）