Abstract
<i>Ambrosia psilostachya</i> is a plant of North American origin, well-domesticated in Poland. It covers ruderal habitats and is found in crops and in city green areas. The density of ragweed shoots in the researched areas ranged from 55 to 111 per m<sup>2</sup>. The production of biomass of this species relates to the production of synanthropic communities and city lawns. The factor limiting the population is cutting which affects mostly the number of shoots per patch, less considerably the state of a single individual. Habitats affected by mechanical factors are the biggest source of pollen causing allergies .
Highlights
Species of the genus Ambrosia represent a group of alien plants occurring in the flora of Poland
The length of all inflorescence shoots on the plant ranged from nearly 4.5 cm in ruderal habitats to over 75 cm in roadside habitats
Lawn-mowing under urban green areas conditions was not a factor limiting the size of male inflorescences
Summary
Species of the genus Ambrosia represent a group of alien plants occurring in the flora of Poland. They have the status of ephemerophytes or kenophytes (Rutkowski , 2004). In Poland it appears in a dozen or so regions far from one another (Zając and Zając , 2001) It is dispersed throughout the country and the pollen of this plant is noted in the air of many cities. It comes from local sources and is transported from far away (Misiewicz , 1976; Stępalska et al 2002; P u c , 2006; Smith et al 2008)
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