Introducing flora, life forms and geographical distribution of invader plants in Ardabil plain

Identification of weed or invader flora has special role in the adaption of suitable strategies for optimum management, increasing performance of agricultural production and thus improving economic efficiency. Study of weed or invader species based on the fieldworks, specimens were collected and transfred to the herbarum and identified. Results show that from the identified plant species of the study area, 182 species are grows at the irrigated and dry fariming and edge of those lands, which are belong to 31 families and 129 genera. The among of them, Poaceae, Asteraceae, Brassicaceae, Fabaceae and Lamiaceae families have the highest frequency. Among the identified weed species 35.68% (65 species) have medicinal values. The life forms of the identified species using Raunkiaer's method were: Therophytes (Th) with 64.84% (118 species), Hemicryptophytes (He) with 28.57% (52 species), which are the dominant lifeforms. From the crotype perspective, the most of the species belongs to Irano Turanean and then Euro- Siberian, and Mediteranian regions. According to the IUCN categories and red data book of Iran species were classified, and 6 endemic species and 10 low risk and data deficiency species were among the identified lists. By considering these results, struggling and eliminating invader species will not create disruption from the environmental perspectives.