chapter  10
Floral Scent and Pollinator Attraction in Sexually Deceptive Orchids
ByManfred Ayasse
Pages 24

Acknowledgments.................................................................................................. 236 References.............................................................................................................. 236

With about 20,000 to 30,000 species, the orchids comprise one of the largest angiosperm families.1 An outstanding feature of orchid flowers is their variety in form and function and their diversity in pollination systems, a phenomenon that was noticed by Charles Darwin.2 Most remarkable are those species that employ deceit rather than food rewards to attract pollinators.3,4 Among the approximately 10,000 deceptive species,5 food deceptive orchids are the most numerous. Certain flowers of the food deceptive species mimic the floral structure of food providing species.1 Most of the species, however, are “nonmodel” mimics that match a general search image for flower visiting insects.1,3,4 Other orchid species imitate sites for oviposition3 or sleeping holes for solitary bees.6