紫茎泽兰（Ageratina adenophora），也被称为紫茎泽兰，是一种多年生草本植物，属于菊科紫茎泽兰属。它的茎直立，分枝对生，叶对生，质地薄，呈卵形、三角状卵形或菱状卵形。管状花两性，呈淡紫色，瘦果则是黑褐色，长椭圆形。此外，它的冠毛是白色的，纤细且与花冠等长。紫茎泽兰的花果期主要在4-10月之间。 这种植物原产于南美洲，但约在20世纪40年代由缅甸传入中国云南临沧地区最南部的沧源、耿马等县。现在，它在云南、贵州、四川、广西、重庆等地广泛分布。值得一提的是，紫茎泽兰的生命力和繁殖力非常强大，每株可以结出3万-4.5万粒种子，甚至多达10万粒。这些种子随风飘移散落，极易在裸地和稀疏植被的生境中定植生长。 Ageratina adenophora, also known as Ageratina Adenophora, is a perennial herb belonging to the genus Ageratina in the composite family. Its stems are erect, branches opposite, leaves opposite, thin texture, ovate, triangular ovate or rhomboid ovate. The tube flowers are bisexual and pale purple, while the achenes are dark brown and oblong. In addition, its crest is white, slender and equal in length to the corolla. The flowering period of the purple orchid is mainly between April and October. This plant is native to South America, but it was introduced from Myanmar to Cangyuan and Gengma counties in the southernmost part of Lincang region of Yunnan Province in China in the 1940s. Now, it is widely distributed in Yunnan, Guizhou, Sichuan, Guangxi, Chongqing and other places. It is worth mentioning that the vitality and fertility of purple stems are very strong, and each plant can produce 30,000-45,000 seeds, or even as many as 100,000 seeds. These seeds drift and scatter in the wind, and are easy to colonize and grow in bare land and sparse vegetation habitats. السيقان الأرجواني