形态描述

多年生草本，高20-100厘米。茎直立，下部常有稀疏的糙毛，上部有分枝。叶对生；基部叶有长柄、披针形或匙形；下部叶羽状全裂，裂片长圆形；中部及上部叶3-5深裂，裂片线形或披针形，中裂片较大，两面及边缘有细毛。头状花序单生于枝端，径4-5厘米，具长花序梗。总苞片外层较短，披针形，长6-8毫米，顶端尖，有缘毛；内层卵形或卵状披针形，长10-13毫米；托片线状钻形。舌状花6-10个，舌片宽大，黄色，长1.5-2.5厘米；管状花长5毫米，两性。瘦果广椭圆形或近圆形，长2.5-3毫米，边缘具膜质宽翅，顶端具2短鳞片。花期5-9月。

分布地区

原产美洲的观赏植物，在我国各地常栽培，有时归化逸为野生。

主要用途

全草具清热解毒之功效。

其它

引用出处：中国植物志

中国植物志英文版

Perennials, 40-60 cm. Aerial nodes proximal to first peduncle usually 6-10+ cm, upper 1-3 internodes 4-7+ cm. Leaves mostly cauline on proximal 2/3-7/8 of plant height; petioles absent or 10-35+ mm; blades usually 1(or 2)-irregularly pinnately or ± pedately lobed with (3-)5-9+ lobes, rarely simple, simple blades or terminal lobes narrowly lanceolate to linear or filiform, 15-45(-90+) × (0.5-)2-8(-12+) mm. Peduncles 8-15(-25+) cm; calycular bracts lanceolate to linear, 3.5-9+ mm; phyllaries lanceolate-ovate, 7-9(-12) mm. Ray limbs yellow, 12-25+ mm. Disk corollas 3.3-4.8 mm, apices yellow. Achenes 2-3+ mm, wings spreading, ± papery, entire or irregularly toothed to pectinate. Fl. May-Aug. Sandy soils, ditches and roadsides, other disturbed sites, granite and sandstone outcrops. Widely cultivated and naturalized in China [native to North America].----from “Flora of China”