Synanthropic species of Asteraceae in Michoacán, Mexico

To study synanthropic plants (weeds), weeds need to be separated from non-weeds, a difficult task due the existing gradient in nature. A representative family of Mexican flora (Asteraceae) and state very rich species (Michoacán) are used as model for this additional analyses. total 357 listed based on critical review specimens bibliographic information, well defined criteria. In addition, tribes, growth forms, geographic similarities with other states examined endemic, more widespread native, introduced weeds. The main difficulty differentiating non-weeds was lack accurate habitat information herbarium labels. Most grew both disturbed natural environments. Nearly half were endemic country, only 4% introduced. major Asteraceae tribes had relatively similar proportions weeds, but exotics concentrated tribe Cichorieae. Floristic mainly towards south-central Mexico. herbs less than annuals. We contribute delimitation understanding species.