Magazine  (22 Jan 1887)  Page(s) 77.  
 
The Tree Pæony. 
...For the last twenty years or longer we have had to look to our French neighbours for new sorts of Tree Pæony, for since they have taken the work of hybridising and raising seedlings in hand they have supplied us with all the finest sorts.  Until now the list is long- too long, in fact, for names are given where very shadowy differences exist.
List of select Varieties.
Vandermaeli, pale blush

Magazine  (26 Feb 1876)  Page(s) 197.  
 
The Best Tree Peonies.
The following list contains some of the very best varieties of tree Peonies or Moutans at present in cultivation; I obtained it from my friend M. Charles Verdier, of Paris, who makes Peonies his special study; among them, as will be seen, are few novelties, but M. Verdier states that the newer varieties are generally inferior to the older kinds:
Vandermaelii, blush, almost white...

Website/Catalog  (1861)  Page(s) 58.  
 
Paeonia arborea.
59. Vandermaelenii (Belgium)......20 Neugroschen.

Website/Catalog  (1860)  Page(s) 28.  
 
Chinese Tree Pæonies. — Pæonia Moutan.
These are the most splendid and showy of all flowering shrubs, and among the most rare.
The flowers are mostly fragrant, and all are double, unless denoted otherwise.  They are perfectly hardy, and will withstand the winters of our most northern States and the Canadas.  They bloom in May, ten to fifteen days before the Chinese Herbaceous varieties.
The following are imported varieties.  We can supply extra size plants of most of the varieties, at a moderate advance in prices.
97.  Vandermaeli (Triomphe de)...  Monstrous, pale blush, centre rosy purple, full, splendid...  $2.00 to $3.00 

Website/Catalog  (1857)  Page(s) 9.  
 
Pivoines en Arbres .... Vandermaelii (Belgique), fleur très-grande, pleine, blanche, légèrement rosée ... 3 francs

Website/Catalog  (1855)  Page(s) 16.  
 
Tree Pæonies.
Among the choicest hardy shrubs, the Tree Pæony and its numerous varieties stand preeminent.  By the labors of the French and Belgian cultivators, many new varieties have been produced, of remarkable beauty, and distinct in their character.  A larger part of these have been added to our collection, and yearly accessions will be made till all are added to our list.
Vandermaelii...  $2.00

Website/Catalog  (1847)  Page(s) 34.  
 
Végétaux de pleine terre
Pæonia moutan Vandermaeli (Belg)...  12 fr

Magazine  (1846)  Page(s) Vol. IV, p. 69.  
 
PROCÈS-VERBAUX ... Séance du 5 mai 1846 .... Les objets suivants ont été déposé sur le bureau: ...
Par M. Verdier, Pæonia arborea Vandermaelii (Belgique), et Pæonia arborea maxima plena (Italie).