One layer of up to 8 petals, surrounding a central stamen cluster. Many sasanquas and species are this form. E.g. 'Spencer's Pink', 'Yuletide'.

Two or more layers of 9 or more petals, again surrounding a central bunch of stamens. E.g. 'The Czar', 'White Nun'.

One or more rows of large outer petals, lying flat or undulating, the centre a convex mass of petaloids and stamens. E.g. 'Elegans'.

Also called informal double. Many layers of irregular and waved petals. E.g. 'Debutante', 'Tomorrow'.

Many layers of petals. The flower opens as a formal double, but when fully open shows stamens in the centre. E.g. 'Tabbs'.

Many rows of regular petals, building up to the centre, and never showing stamens. E.g. 'Otome', 'Desire'.