Hybrid lactiflora.  Dark red.  Staminoids edged yellow.  Japanese (anemone, imperial) bloom form.  Midseason.  USDA zone 2a and warmer.   R.H. Jones (1957).

6 favorite votes.  

Hybrid / Species crosses.  Dark red.  Large, single bloom form.  Very early.  USDA zone 2a and warmer.   Edward Auten, Jr. (1937).

6 favorite votes.  

Hybrid lactiflora.   Joseph Bernstein.

6 favorite votes.  

Hybrid lactiflora.  White, yellow center.  Large, cupped, Japanese (anemone, imperial), ruffled bloom form.  Late.  Height of 42" (105 cm).   Charles F. Wassenberg (1954).

6 favorite votes.  

Hybrid lactiflora.  Red.  Japanese (anemone, imperial) bloom form.   Robert William Tischler (1976).

6 favorite votes.  

Hybrid lactiflora.  White, cream center.  Moderate fragrance.  Very large, Japanese (anemone, imperial) bloom form.  Mid.  USDA zone 2a and warmer.  Height of 30" to 3' (75 to 90 cm).   Myron D. Bigger (1937).

6 favorite votes.  

Hybrid lactiflora.  Seashell-pink, lighter center, salmon-pink shading, ages to lighter .  Small bonnet.  Rose, sweet fragrance.  Large, full, rose bloom form.  Early-to-mid.  USDA zone 2a and warmer.   Unknown Dutch Breeder (1905).

6 favorite votes.  

Hybrid lactiflora.  Dark red.  Very crinkled petals.  Large, single bloom form.  Midseason.   Gilbert H. Wild & Son (1957).

6 favorite votes.  

Hybrid rockii, Tree peony.  Light pink, dark red flares, ages to white .  Moderate fragrance.  Large, semi-double bloom form.  Midseason.   Chen Dezhong (2002).

6 favorite votes.  

Hybrid lactiflora.  Light pink.  Mild fragrance.  Large, double, rose bloom form.  Mid-to-late.  Height of up to 35" (up to 90 cm).   Walter Z. Mains (1955).

6 favorite votes.  

Hybrid suffruticosa.  Pink.  Golden-yellow collar.  Moderate fragrance.  Double bloom form.   Charles His (1851).

6 favorite votes.  

Hybrid lactiflora.  Pink, purple shading, yellow center.  Moderate fragrance.  Single bloom form.  Early.  USDA zone 2a and warmer.  Height of up to 39" (up to 100 cm).   Max Josef Goos (1912), August Koenemann (1912).

6 favorite votes.  

Hybrid rockii.  Deep pink, mauve shading, cream center, purple flares.  Mild fragrance.  Medium to large, single to semi-double, lotus bloom form.  Early-to-mid.   Chen Dezhong (1994).

6 favorite votes.  

Hybrid lactiflora.  French white or blush white, ages to white .  Center flower is double; side shoots produce semi-double, saucer-shaped blooms showing golden stamens.  Moderate fragrance.  Large, semi-double to double, cupped bloom form.  Early-to-mid.  USDA zone 2a and warmer.  
Height: up to 3' (up to 90cm).   Kelway (and Son) (1902).

6 favorite votes.  Average rating: EXCELLENT.  

Hybrid lactiflora.   D.M. Andrews (1923).

6 favorite votes.  

Hybrid lactiflora.  Dark red, violet-red shading.  Double bloom form.  Midseason.  Height of 31" to 35" (80 to 90 cm).   Unknown breeder (1930).

6 favorite votes.  

Hybrid lactiflora.   Edward Auten, Jr. (1937).

6 favorite votes.  

Hybrid lactiflora.  Pink, yellow undertones, ages to lighter .  Medium, bomb, cupped bloom form.  Early-to-mid.  Height of up to 30" (up to 75 cm).   Robert William Tischler (2000).

6 favorite votes.  

Hybrid lactiflora.  Deep pink and light pink.  Various colours on same plant, also white..  Moderate fragrance.  Large, double, bomb bloom form.  Late.  USDA zone 2a and warmer.  Height of up to 28" (up to 70 cm).   Carl G. Klehm (1960).

6 favorite votes.  

Species, Tree peony.  Color varies from purple-crimson to peach; yellow and white forms are classed separately.  Medium, single bloom form.  USDA zone 6b through 9b (default).  
Height: 5½' to 6' (165 to 185cm).   Père Jean Marie Delavay (1884).

6 favorite votes.  

Herbaceous species, Species.  Red.  Single bloom form.  USDA zone 2a and warmer.  

6 favorite votes.  

Hybrid / Species crosses.  Dark red, white streaks, stripes, flecks.  Single bloom form.  Midseason.  Height of up to 2' (up to 60 cm).   Nathan Rudolph (1963).

6 favorite votes.  

Hybrid lactiflora.   Kelway (and Son) (1917).

6 favorite votes.  

Hybrid lactiflora.  Purple - crimson.  Single bloom form.  Mid-to-late.  
Height: up to 39" (up to 100cm).   Peter Barr (1910).

6 favorite votes.