Article (magazine)  (Jan 1955)  Page(s) 56.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Japanese, Crimson, 'Abokiu' (Abo Palace) (Japan before 1896), [Nurseries] Oberlin Peony Gardens

Book  (Apr 1907)  Page(s) 13.  
 
4. A Bo Kiu, P. moutan
(1) 1903, Jap. Cat. Fewkes' MSS

Website/Catalog  (1898)  Page(s) 12.  
 
Peonies.
Paeonia Mouton. Tree Peony.
This plant is already well-known to the West. Flowers in May, widely differing in color and form. Stems either shrubby or branched from the foot. The best species are native of central Japan. The flower often attains one foot in diameter. These plants have fanciful names in Japanese, which we give with as nearly as possible the English equivalent.
Double grafted set of 20, no two alike, $4.00. 1 case of 100 peonies comprising 25 varieties, $18.50.
II. Deep Crimson.
Abokyu, A Babylonian Palace...