Book  (Jan 2000)  Page(s) 227, 228.  
 
Page 227: Flower Rivalry. See 'Hanakisoi'.
Page 228: Hanakisoi Tree Peony. ex Japan 1926. Also sold as 'Flower Rivalry'... pink

Book  (Jan 2000)  Page(s) 228.  
 
Hana Kisoi. See 'Hanakisoi'.

Book  (Jan 1999)  Page(s) 60.  Includes photo(s).
 
The tree peony Hana Kisoi reached Europe and the USA from Japan in 1926.

Website/Catalog  (1956)  Page(s) [1].  
 
Japanese Tree Peonies
Hana Kisoi (Floral Rivalry) Fine brilliant pink double...$7.00

Article (magazine)  (Jan 1955)  Page(s) 57.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Pink, 'Hana-kisoi' (Floral Rivalry) (Jap. bef. 1929), [Gardens] Scott Foundation, Whitnal Park Botanical Gardens, [Nurseries] William Gratwick, Oberlin Peony Gardens

Magazine  (1953)  Page(s) 216.  
 
Hana Kisoi (Floral Rivalry)

Magazine  (Sep 1944)  Page(s) 24.  
 
Tree Peony Supplement to the Manual
John C. Wister, Germantown, Pa.
Alphabetical Check List of Tree Peony Names, August 1944
Japanese Moutan type; Pink; HANA-KISOI (Floral Rivalry) (Japan, before 1929) Chugai Shokobutsu Yen Nursery, near Kobe, Japan, 1929-40; Oberlin 1938, in 1943 renamed Cherry Blossom; Farr Nursery Co., Weiser Park, Pa, 1941.
Name in Large Caps in Black Type indicates accepted names of varieties in American commerce 1944; Bobbink & Atkins Nursery, Rutherford, N. J., 1943.

Website/Catalog  (1941)  Page(s) [3].  
 
Tree Peonies
Hanakisoi (Contest of Flowers). Enormous; double; deep cherry; waved petals. Tall growth...$20 00

Website/Catalog  (1939)  Page(s) [1].  
 
Tree Peonies (Pæonia arborea)
Japanese Tree Peonies 
English translation in parentheses
38. Hanakisoi (Contest of flowers). Deep cherry; waved petals; enormous size bloom. Exceptionally tall grower. Free bloomer... $20.00