Geraniol or 3,7-Dimethylocta-2,6-dien-1-ol is a fruity/floral (rose-like) aroma. It is used as a ‘floral’ hop note in flavour training kits so when you hear a beer described as having a flowery hop note, geraniol is probably responsible. As always I add the caveat that beer aroma is a terrifically complex thing so the floral character you experience could also be in the absence of geraniol. Geraniol is found in the essential oil of hops although it is likely that geraniol in beer comes from hydrolysis of geraniol isobutyrate than from the essential oil. Cascade is particularly high in geraniol.
Geraniol like iso amyl ethanoate is an attractant to bees but strangely is also used in mosquito repellant.
On a molecular level geraniol looks like German balloon dog porn. Anyone got a bucket of water?
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