Article (magazine)  (Jan 1955)  Page(s) 59.  
 
Alphabetical Check List of Tree Peony Names In  Public Collections And/or Available in Nurseries 1954-1955
Chinese, Crimson, 'Osiris' (Chin.-For.), [Gardens] Morton Arboretum, [Nurseries] Oberlin Peony Gardens

Website/Catalog  (1941)  Page(s) [3].  
 
Tree Peonies
Osiris. Double; darkest velvety red. Low growing—suitable for rock-gardens. Profuse...$6 00

Website/Catalog  (1924)  Page(s) 152.  
 
Pivoines en arbre...Osiris.- Presque pl., marron noirâtre, foncé.

Website/Catalog  (1910)  Page(s) 36.  
 
European Grown Tree Peonies
Osiris. Medium sized bloom, dark maroon, extra.

Website/Catalog  (1893)  Page(s) 42.  
 
Tree Pæonies.  Pæonia Arborea.
This beautiful group of shrubs is among the oldest of introductions from Japan, but magnificent new varieties have been added from year to year until we have a long list of wonderful forms.  They are quite distinct from the herbaceous section, and have shades of color not found in the latter; and when once established form compact bushes, which in spring are covered with the gigantic blooms.  These pæonies are a little tender in exposed situations north of Boston; but if planted in a sheltered, warm location, and protected during the first two winters by a covering of pine boughs, or other loose material, will eventually establish themselves, and form one of the most decorative features of the garden.  Like the herbaceous kinds, they enjoy rich soil, and the blooms last longer and come finer when partially sheltered from the hot sun.  They are well worth the little trouble entailed in their cultivation.  We can offer strong plants of the leading and most hardy kinds; but as they are slow and difficult of propagation, this fact will account for their relatively higher cost over the herbaceous kinds.  Having secured a large stock of these beautiful plants, we are enabled to offer them at lower prices than ever before.  2 year plants, 75 cents each; 3 year plants, $1.00 each.
Osiris.  Deep blackish chestnut, unique color.

Magazine  (9 Jul 1892)  Page(s) 24.  
 
Tree Pæonies.
A selection of a few really first-rate varieties is here given: Blanche de Chusan, pure white; Caroline Blanche, white with crimson stain at the base of the petals; Cœlestis, white, large, and very fine; Duchesse d'Anjou, rose and white; Louise Mouchelet, salmon-pink, a lovely shade; Lord Macartney, crimson; Mme. de Vatry, rich glowing rose; Mme. Stuart Low, salmon shading to red; Osiris, dark maroon-crimson; Reine Elizabeth, deep rose, a magnificent flower and one of the very best kinds; Robert Fortune, rosy-crimson; Samarang, vermillion-red; Souv. de Gand; and Triomphe de Vandermael, bright rose, large and very double.

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.
Osiris, very dark crimson

Magazine  (1885)  Page(s) 204.  
 
M. Fr. Morel, une prime de 1^re classe pour ses Pivoines, et mention spéciale des variétés Osiris et Bijou de Chusan. 

Website/Catalog  (1873)  Page(s) 62.  
 
Paeonia arborea. Pivoines en arbre.
31. Osiris. Prachtvolle Sorte! Dunkelpurpur, innen Schwarz!. Superbe espèce! Rouge pourpre au fond noir!...6 fr.

Magazine  (29 Jun 1872)  Page(s) 701.  
 
The Best Pæonies.
In examining a collection of Herbaceous and Tree Pæonies lately, we have decided that (although all are ornamental) there are in reality but a few worthy of cultivation. Of these the following is a list:
Tree Pæonies: Bijou de Chusan, Carolina, Colonel Malcolm, Comte de Flandres, Donckelaarii, Elizabeth, fragrans maxima plena, Lambertiana, La Ville de Saint Denis, Louise Mouchelet, Madame Stuart Low, Osiris, Ranieri, Jules Pirlot, Rinzii, Rosa Mundi, Triomphe de Vandermalin, Vandermaelii, Van Houttei, and Zenobia.