Single - usually only 5 petals with stamen displayed.
Semi-Double - a loose arrangement of up to 20 petals which open and reveal stamens
Hybrid Tea - classic rose shape with a long bud and an average of fifty petals
Quartered - plump round buds open to deep urns revealing a swirling mass of four sections of petals rotating around four different centres
Rosette - masses of smaller very pointed and ruffled petals which lay flat and have a small button eye in the centre hiding the stamen