Hybrid lactiflora.  Red.  Double bloom form.  USDA zone 2a and warmer.   Alonzo B. Franklin (1928).

5 favorite votes.  

Hybrid lactiflora.   Dr. Frederick G. Brethour.

5 favorite votes.  

Hybrid lactiflora.  Violet - purple.  Large, full bloom form.  Late.  USDA zone 2a and warmer.   Jacques Calot (1868).

5 favorite votes.  

Hybrid lactiflora.  Red.   Unknown Chinese Breeder(s).

5 favorite votes.  

Hybrid lactiflora.  Pink.  Japanese (anemone, imperial) bloom form.  Mid.  USDA zone 2a and warmer.   William Brown (1949).

5 favorite votes.  

Hybrid / Species crosses.  Cream.  Moderate fragrance.  Single bloom form.  Height of up to 32" (up to 80 cm).   Eivind Hansen (2006).

5 favorite votes.  

Hybrid rockii, Tree peony.  Light pink, purple flares.  Single to semi-double bloom form.  Early.  USDA zone 2a and warmer.  Height of up to 5' (up to 150 cm).   William H. Gratwick III (1985).

5 favorite votes.  

Hybrid / Species crosses.  Lavender, ages to lighter .  Single to semi-double bloom form.  Early.  USDA zone 2a and warmer.  Height of 1' to 22" (30 to 55 cm).   Prof. Arthur Percy Saunders (1939).

5 favorite votes.  

Hybrid lactiflora.  Red.  None to mild fragrance.  Large, double bloom form.  Moderate, Early.  USDA zone 2a and warmer.  Height of up to 35" (up to 90 cm).   BRAND (1907).

5 favorite votes.  

Hybrid lactiflora.  White, yellow center.  Mild fragrance.  Single, cupped, Japanese (anemone, imperial) bloom form.  Early-to-mid.  USDA zone 2a and warmer.  Height of 30" to 3' (75 to 90 cm).   Walter Marx (1965).

5 favorite votes.  

Tree peony.  Red.  Mild fragrance.  Crown bloom form.  USDA zone 2a and warmer.  Height of 5' (150 cm).  

5 favorite votes.  

Hybrid lactiflora.  Crimson.  Mild, medicinal fragrance.  Medium, double bloom form.  Late midseason.  USDA zone 2a and warmer.  Height of 32" to 39" (80 to 100 cm).   Millet & Son (1902).

5 favorite votes.  

Hybrid / Species crosses.  Red.  Bomb, Japanese (anemone, imperial) bloom form.  Midseason.  USDA zone 2a and warmer.  Height of up to 30" (up to 75 cm).   Don Hollingsworth (1979).

5 favorite votes.  

Hybrid lactiflora.  Light pink or blush, ages to white .  Large, very double bloom form.  Late.  
Height: up to 35" (up to 90cm).   Francis H. Allison (1931).

5 favorite votes.  

Hybrid lactiflora.   James Pillow (1924).

5 favorite votes.  

Hybrid lactiflora.  White, light pink highlights.  Moderate fragrance.  Very large, single, cupped bloom form.  USDA zone 2a and warmer.  Height of up to 4' (up to 120 cm).   Walter Marx (1965).

5 favorite votes.  

Hybrid / Species crosses.  Red.  Small, single bloom form.  Early.  Height of 2' to 25" (60 to 65 cm).   Robert William Tischler (1995).

5 favorite votes.  

Hybrid lactiflora.  Pink.  Prominent yellow stamens.  Semi-double bloom form.   Ernest Flint Kelsey (1936).

5 favorite votes.  

Hybrid lactiflora.  Pink.  Japanese (anemone, imperial) bloom form.  USDA zone 2a and warmer.   William Brewster (1952), William Brown (1952).

5 favorite votes.  

Hybrid rockii.  White, dark purple flares.  Moderate fragrance.  Double, ruffled bloom form.  Early.   Chen Dezhong (1992).

5 favorite votes.  

Hybrid / Species crosses.  Red.  Single bloom form.  Height of up to 29" (up to 75 cm).   William Henry Krekler (1978).

5 favorite votes.  

Hybrid lactiflora.  Pink to deep pink, darker streaks, stripes, flecks, cream streaks, stripes, flecks.  Cactus-dahlia-style.  None / no fragrance.  Small to medium bloom form.  Early-to-mid.  USDA zone 2a and warmer.  Height of 28" to 30" (70 to 75 cm).   William Henry Krekler (1999).

5 favorite votes.  

Hybrid lactiflora.  White, lemon-yellow undertones.  Moderate fragrance.  Double bloom form.  Late midseason.  USDA zone 2a and warmer.  Height of up to 32" (up to 80 cm).   Col. Jesse C. Nicholls (1938).

5 favorite votes.  

Hybrid lactiflora.  Red, purple shading, silver(y) edges.  Large, double bloom form.  Midseason.  Height of up to 32" (up to 80 cm).   Auguste Dessert (1915).

5 favorite votes.