First reports of Bidens bipinnata and Bidens vulgata in Bulgaria
Bidens bipinnata (Asteraceae), native to South America, was found for the first time in Bulgaria at the railway station and harbour in the city of Varna, on the Black Sea Coast floristic region. Bidens vulgata (Asteraceae), native to North America, was recorded in several places near the Danube River in the Danubian Plain floristic region in Bulgaria.
Petrova AS ; Vladimirov V (2009) Two alien species of Bidens (Asteraceae) new to the Bulgarian flora. Phytologia balcanica 15(3), 367-371.