XVI International Botanical Congess

Baccharis dracunculifolia is pollinated by bees, flies and wasps. CCA analysis showed that its floral volatiles were significantly correlated with hourly visitation patterns of insects to flowers. Despite the relatively low overall intersexual floral scent similarity, some common signals permit that some of the floral visitors are directed to both sexual morphs. Monoterpene hydrocarbons were mainly correlated with native social bees only on male flowerheads. Oxygenated monoterpenes were associated with solitary bees in male and female inflorescences while sesquitepene alcohols were associated with solitary bees and flies in both sexual morphs. floral activity of wasps had no significant correlation with floral scents.