Magazine  (Sep 1944)  Page(s) 23.  
 
Tree Peony Supplement to the Manual
John C. Wister, Germantown, Pa.
Alphabetical Check List of Tree Peony Names, August 1944
Japanese Moutan type; White; HAKUO or HAKUOW (White Yellow) (White Majesty) (Japan, before 1929) Chugai Shokobutsu Yen Nursery, near Kobe, Japan, 1929-40; Oberlin in 1943 renamed Old Ivory.
Name in Large Caps in Black Type indicates accepted names of varieties in American commerce 1944.

Website/Catalog  (1940)  Page(s) 13.  
 
Choice Varieties...
Haku-ow, Sulphur yellow with slight purplish crimson at base, semi-double, discernible yellow color among many flower ...Each [$] 3.70

Magazine  (17 Aug 1929)  Page(s) 131.  
 
Tree Paeonies in Japan.
Mr. Sinzaemon Tanaka's work on the hybridization of Tree-Paeonies is much admired, and his name will be long remembered as that pf a great raiser of Tree-Paeonies. Mr. Tanaka commenced raising varieties in 1894, after he learned the method from the Rono Zasshi (then a leading agricultural journal in Japan). Since then, after many difficulties and failures, he has raised nearly two-hundred-and-fifty varieties. The following are a few of the best he has raised: Hakuo, Haku-Unryo, Nagoya-Jo, Hoo-Jo, Kanyo-Kiu, Kinpai and Godaishu.

Book  (1907)  Page(s) 102.  
 
1092. HAKU O; P. moutan.
(1) 1903, Jap. Cat. Fewkes' MSS.

Website/Catalog  (1896)  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.
I. White.
Hakuwo, White-haired Man...