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Chemical basis for the relationship between Ophrys orchids and their pollinators. 1. Volatile compounds of Ophrys lutea and O. fusca as insect mimetic attractants/excitants



Chemical basis for the relationship between Ophrys orchids and their pollinators. 1. Volatile compounds of Ophrys lutea and O. fusca as insect mimetic attractants/excitants



Chemica Scripta 25: 283-294



Orchids of this genus produce no nectar, but give off volatile mixtures attractive to male Hymenoptera. Males of several Andrena species visit O. lutea and O. fusca flowers and pollinate them. Analyses of volatiles from 2 forms of O. lutea and 6 forms of O. fusca are presented here. Of particular interest as possible pollinator attractants/excitants is a series of aliphatic 1- and 2-alcohols, especially 1-octanol and 1-nonanol, and the terpenes geraniol, citral, nerol and E,E-farnesol.

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