Peonies, The Manual of the American Peony Society (1928)  Page(s) 248.  
 
Tree Peony Check List
Alphonse de Candolle. Double. (Burdin, 1867.) V. Lemoine 1892; Louis Van Houtte 1873; Kelway & Son. 1867, 1889, Louis Paillet 1889 as new.

Peonies, The Manual of the American Peony Society (1928)  Page(s) 248.  
 
Tree Peony Check List
Alope Cuprea. (Krelage, 1869.) 

American Peony Society Bulletin (Sep 1944)  Page(s) 13.  
 
Tree Peony Supplement to the Manual
John C. Wister, Germantown, Pa.
Alphabetical Check List of Tree Peony Names, August 1944
Alexandra (Named by Paillet [in his catalogue?] 1889)

Small Caps indicate accepted names, but varieties obsolete.

Peonies, The Manual of the American Peony Society (1928)  Page(s) 248.  
 
Tree Peony Check List
† Alexndra. (——, 1899.) 

† Never widely distributed.

Peonies, The Manual of the American Peony Society (1928)  Page(s) 270.  
 
Tree Peony Check List
*Zenobia. Syns. Atropurpurea; Alexandre de Humboldt. (China, Fortune, 1864; 1889.) Haage & Schmidt 1864; Louis Paillet 1889; Louis Van Houtte 1873; V. Lemoine 1892; Barbier & Co. 1900; A. Dessert 1905, 1899; Old Farm Nursery 1924; E. H. Krelage 1867.

*Presumed to be in commerce, 1927.

NB: It is not clear why the author considers these three peonies to be synonymous.

Peonies, The Manual of the American Peony Society (1928)  Page(s) 248.  
 
Tree Peony Check List
Alexander von (or de) Humboldt. Japan. (K. Siebold, 1867.) See Zenobia.

Peonies, The Manual of the American Peony Society (1928)  Page(s) 248.  
 
Tree Peony Check List
Alcyon (Alcione). Double. (Krelage, 1867.) 

Peonies, The Manual of the American Peony Society (1928)  Page(s) 248.  
 
Tree Peony Check List
Alchemist. (Kelway, 1897.)

Peonies, The Manual of the American Peony Society (1928)  Page(s) 247.  
 
Tree Peony Check List
†Albida longipetala. (Haage & Schmidt, 1893.)

† Never widely distributed.

Peonies, The Manual of the American Peony Society (1928)  Page(s) 247.  
 
Tree Peony Check List
Albida plena. (Mount[norris] 1825.)