Miniature.  Orange - yellow, light yellow edges.  None / no fragrance.  Small, very double, borne mostly solitary, flat, rosette bloom form.  Blooms in flushes throughout the season.  
Height: up to 14" (up to 35cm).  Width: up to 6" (up to 15cm).

Hybrid suffruticosa, Tree peony.  Yellow, carmine-pink shading, yellow outer petals.  Small to medium bloom form.  

Hybrid suffruticosa, Tree peony.  Single bloom form.  

Hybrid rockii, Tree peony.  Rose-pink and cream, lighter outer petals, violet flares, ages to blush .  Color variable.  Mild to strong fragrance.  Large, full bloom form.  Early.  
Height: up to 43" (up to 110cm).  

Hybrid rockii, Species Cross, Tree peony.  Yellow, dark red flares.  Prominent gold stamens.  Mild to strong fragrance.  Small to medium, single to semi-double, cupped bloom form.  Early-to-mid.  
Height: up to 43" (up to 110cm).  

Hybrid rockii, Tree peony.  Rose-pink, blush outer petals, lighter edges, violet-red flares.  Notched petals; gold stamens; yellowish green carpels.  Mild to strong fragrance.  Large, semi-double to double, ruffled bloom form.  Early-to-mid.  
Height: up to 39" (up to 100cm).  

Intersectional Hybrid / Itoh.  Lilac-pink.  Gold stamens surround green carpels.  Mild to strong fragrance.  Small to medium, single, cupped bloom form.  Early.  
Height: up to 2' (up to 60cm).  

Hybrid rockii, Hybrid suffruticosa, Tree peony.  Violet-red or fuchsia / magenta, black flares.  Rounded, notched petals; yellow stamens.  Mild to strong fragrance.  Large, single to semi-double, cupped, ruffled bloom form.  Early-to-early mid.  
Height: up to 47" (up to 120cm).  

Hybrid suffruticosa, Tree peony.  Scarlet.  Notched, frilled, glossy petals, gold stamens, no flares.  Mild to strong fragrance.  Medium, single to semi-double bloom form.  Early.  
Height: 28" to 39" (70 to 100cm).  

Shrub.  Deep pink.  Single (4-8 petals) bloom form.  

Hybrid Tea.  Dark red.  Strong fragrance.  Full (26-40 petals), borne mostly solitary bloom form.  

Hybrid rockii, Hybrid suffruticosa, Tree peony.  Rose-red, darker flares.  Notched petals; gold stamens; green carpels.  Mild to strong fragrance.  Medium to large, semi-double to double, cupped, ruffled bloom form.  Early-to-early mid.  
Height: up to 39" (up to 100cm).  

Hybrid rockii, Hybrid suffruticosa, Tree peony.  Ruby-red or violet-red, darker flares.  Notched, wide petals; prominent yellow stamens surround pale green carpels.  Mild to strong fragrance.  Large, single to semi-double, cupped, ruffled bloom form.  Early-to-mid.  
Height: up to 4¼' (up to 130cm).  

Hybrid rockii, Hybrid suffruticosa, Tree peony.  Dark red or maroon, black flares.  Ring of gold stamens surround light yellow carpels.  Mild to strong fragrance.  Medium, single, cupped bloom form.  Early-to-early mid.  
Height: up to 39" (up to 100cm).  

Floribunda.  Light pink.  Double (17-25 petals), cupped bloom form.  

Floribunda.  Yellow, orange-red edges.  Double (17-25 petals), in small clusters bloom form.  

Floribunda.  Pink.  Very double bloom form.  

Hybrid rockii, Hybrid suffruticosa, Tree peony.  Rose-pink, lighter outer petals, black flares.  Notched petals, prominent gold stamens.  Mild to strong fragrance.  Very large, single to semi-double, cupped bloom form.  Early-to-mid.  
Height: up to 4'7" (up to 140cm).  

Floribunda.  Carmine-pink.  Semi-double to double, cluster-flowered bloom form.  

Floribunda.  Deep pink, white streaks, stripes, flecks.  Semi-double (9-16 petals) bloom form.