Walking up Doll's Hill earlier today I was heartened by the sight of a Winter Jasmine, Jasminum nudiflorum, flowering abundantly. Though its flowers are clearly designed for insect pollination I have never seen it receive a visit from a bee, hoverfly or whatever.
Jasmine is a member of the Olive Family, Oleaceae. It is thus related to Forsythia, Lilac and Privet, and under a hand lens the structure of the flowers clearly shows their relationship. However, it is also in the same family as Ash trees and there the resemblance is far less obvious.