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Flower Form   There is great variability in peony flower forms. We think this makes them even more interesting and desirable cut flowers. I have assigned each variety one of the following flower form categories. Certain varieties exhibit characteristics such that they are on the borderline between categories. There is also sufficient variability within certain varieties that individual flowers fit in a different flower form category than other flowers of the same variety.

 
Example Varieties
Single Early Scout SINGLE - They have 1 or 2 rows of petals with yellow stamens. Some varieties have very showy pistils and stigmas in complementary colors that markedly enhance the overall display. Although not as full as semi-doubles or doubles, they are very showy and have large flowers with a few exceptions I have noted in the individual variety descriptions.
SINGLE
Early Scout
Semi Double Cytherea SEMI-DOUBLE - They have large, full, very showy flowers with multiple rows of petals. Although they have yellow stamens and some varieties have showy pistils and stigmas in complementary colors, these characteristics usually are of secondary interest compared to the petal display.                               
SEMI-DOUBLE
Cytherea
Double (True Double) Vivid Rose DOUBLE - Double types and bomb types are actually separate categories, but I have grouped them together for simplicity in my DOUBLE category because they both have large, very full, very showy flowers. Bomb types have a dense explosion of irregular petals in the center of the flower surrounded by outer rows of guard petals. Double types open in a more regular fashion with numerous rows of petals. Usually, stamens, pistils, and stigmas are not prominently visible in the varieties in my DOUBLE Herbaceous Peony category, but a few do show yellow stamens. All our Tree Peonies in my DOUBLE category are true double types with yellow stamens showing.
DOUBLE (True Double)
Vivid Rose
Double (Bomb Type) Red Charm
DOUBLE (Bomb Type)
Red Charm
Japanese Exclusive variety Esther Heinzman JAPANESE - They have 1 or 2 rows of petals like single peonies, but usually have more full flowers than single varieties. They have no pollen. Instead of fertile stamens the male parts of the flower are staminodes, which are sterile and usually are somewhat enlarged into showy petal-like structures. Occasionally, a few petals are mixed in. The staminodes of some Japanese varieties have exotic and complementary blends of yellow with the ground color of the petals.
JAPANESE
Exclusive variety
Esther Heinzman