Bomb: Broad petaloids in center originate from both carpels and stamens. Guard petals look distinct. Examples: Angel Cheeks, Monsieur Jules Elie, Raspberry Sundae & Red Charm.
Full double: All stamens and carpels have developed into petals resembling the guard petals. Examples: Edulis Superba, Kansas & Shirley Temple.
Japanese: Doubling process has begun in center of flower, with filaments of stamens broadening and anthers becoming very large. Guard petals are same as in single type. Examples: Alice Roberts, Bride’s Dream & Doreen.
Semi-double: Center of flower contains petaloids and stamens intermixed. Guard petals may not be distinct. Examples: Coral Charm, Pink Hawaiian Coral & Coral Sunset.
Single: A ring of broad “guard” petals surrounding a mass of pollen-bearing stamens and seed-bearing carpels. Examples: Cheddar Charm, Jack Frost & Scarlett O’Hara.