Lilac
A lilac was a fragrant flower from Earth.

When the  picked up Barry Waddle in 2373, he claimed Klingons stank, without thinking about the fact that Worf was present. Once Waddle was gone, O'Brien told Worf he liked the way the Klingon smelled, describing it as "sort of an earthy, peaty aroma," to which Bashir added, "with a touch of lilac." 

Later, O'Brien tried to get one of the other senior staff members to benignly sniff the air around Worf and say, "Is that lilac?" ()

Varieties 
 Bajoran lilac

External links 
 

de:Flieder
Earth plants