Abstract
The present study was carried out in Sahastradhara, a famous picnic spot of Doon Valley. During the tourist season, more than 5 lakh tourists visit the site for their recreation. The tourist activities has declined the native species diversity and promoted the introduction of 96 exotic species. Tropical America and Tropical South American plants have contributed to 45% and 2% of the total invasive diversity respectively. Asteraceae with 13 species is the most dominant family of the site.
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