Plumeria flowers have five petals, although flowers with four, six, seven or more petals are not uncommon. Some types of flowers do not fully open and are referred to as shell, semi-shell, or tulip like. Most flowers have a strong pleasant fragrance that is most intense during the early part of the day. A great many different fragrances have been described, but since smell is so subjective and varies for environmental and nutritional reasons, we do not attempt to be comprehensive in its description. We try harder with colors. There seem to be several basic plumeria color schemes: white with a yellow center, yellow, multicolor, pink and red. There is speculation that red is a special case of multicolor. Most of the reds can be more properly referred to as red-purple.