中文摘要：

报道了天津植物新记录共计3种,分别是长芒苋（Amaranthus palmeri）、瘤梗甘薯（Ipomoea lacunosa）和钻叶紫菀（Astersubulatus）.3种植物均原产北美,在中国的一定区域范围内形成了入侵态势.本文对其形态特征、在天津的地理分布和种群动态进行介绍,为其动态监测和科学防治提供重要依据.

英文摘要：

Three exotic plant species of Tianjin were reported, including A maranthus palmeri, Ipomoea lacunosa and Aster subu~atus. The three species are all native to north America, and have formed invasive situation in some areas in China. The morphological characteristics, distribution and population dynamics of these species in Tianjin were briefly demonstrat- ed so as to assist their dynamic monitoring and necessary control.