Book  (1928)  Page(s) 248.  
 
Tree Peony Check List
Alexander von (or de) Humboldt. Japan. (K. Siebold, 1867.) See Zenobia.

Book  (1907)  Page(s) 112.  
 
1221. HUMBOLDT, ALEXANDRE DE; P. moutan...(Siebold)
(1) 1885, The Garden, Vol. 27, p. 33.
(2) 1899, L. Paillet's Cat.
(3) 1906, Dessert's Cat., p.44.
(4)Cornell Plot No. 783.

Website/Catalog  (1903)  Page(s) 26.  
 
Pæonia Arborea (Tree Peonies)
The Tree Peony is really one of the finest plants available for the garden or the conservatory; it is quite hardy and does well under the simplest treatment. The smallest one will flourish in the most astonishing manner, bearing blossoms from 6 to 8 inches across, which will increase every year in beauty and size. In colors, the flowers range in great variety, from a white to a nearly reddish black. [...]
Price: Two-year old, named varieties, purchaser's selection, $1.25 each, $12.00 per dozen...
Alexander de Humboldt. Purple violet, very fine.

Magazine  (10 Jan 1885)  Page(s) 33.  
 
Tree Pæonies.
As to Von Siebold's introductions, they were partly sold to Prince Frederic of the Netherlands, and never passed into commercial hands; the rest, as far as I remember, were bought by Messrs. E. H. Krelage & Son, of Haarlem. Those given over to commerce were—
Alexandre de Humboldt... 

Magazine  (1858)  Page(s) 2.  
 
Pæonia Moutan Sims...
Variétés cultivées à Leide.
Variétés à fleurs de pêche et lila.
Alexandre de Humboldt. Pétales lilas, panachés à la base de pourpre et carmin; périgynion pourpré.