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黄蝉(Allemanda neriifolia)别名黄兰蝉,是夹竹桃科黄蝉属多年生直立灌木。原产巴西,世界各地都有栽培。广东、广西、福建和台湾等地露地栽培,华南以北地区在温室内盆栽。黄蝉成株高约1米。叶片椭圆形或倒卵状长圆形,三五成轮着生于枝条上,嫩叶带紫色,后转翠绿色。花序顶生,总花梗和花梗被短绒毛,花冠黄色,内有红褐色条纹,基部膨大成漏斗状,长4～7厘米,有香气(见彩页,董光亮摄))。裂片圆形或卵
Allemanda neriifolia alias Huang Lan cicada, is a genus of Apocynaceae perennial erect shrubs. Native Brazil, cultivated all over the world. Guangdong, Guangxi, Fujian and Taiwan and other places open cultivation, north of South China in the greenhouse potted plants. Cicada adult about 1 meter high. Oval or obovate oblong leaves, thirty-five into a round was born on the branches, with purple leaves, after turning green. Inflorescence terminal, total pedicel and pedicel short downy hair, corolla yellow, with reddish-brown stripes, inflated base funnel-shaped, 4 to 7 cm long, with aroma (see color pages, Dong Guangliang photo)). Lobes round or ovate