If Serissa is a genus of a flowering plant, what is Westringia a genus of?
Westringia Westringia is a genus of Australian shrubs. As with other members of the mint family their upper petal (or lip) is divided into two lobes. There are four stamens - the upper two are fertile while the lower two are reduced to staminodes. The leaves are in whorls of 3 or 4.
Tristellateia Tristellateia is a genus in the Malpighiaceae, a family of about 75 genera of flowering plants in the order Malpighiales. Species of this genus are woody vines or sometimes shrubs with twining branches. "Tristellateia" includes one species in eastern Africa ("T. africana" S. Moore); a second species ("T. australasiae" A. Rich.) is widespread in southeastern Asia and also commonly cultivated as an ornamental. All other species are endemic to Madagascar.