Article (magazine)  (2001)  
 
....only a solitary, terminal flower is fully developed without additional flower buds, the condition seen in the majority of individuals of P. anomala. Rarely in P. anomala may there be one or two underdeveloped flower buds in the upper leaf axils. In such cases, both conditions, i.e., with or without additional underdeveloped flower buds, may be observed within a single population of P. anomala.

Book  (Jan 1999)  Page(s) 30.  
 
Anomala means unusual, and refers to the finely divided leaves which turn orange brown in autumn... [flowers are] magenta red to crimson rose, the best being brilliant red with yellow stamens. The roots, which grow very large, are cooked and eaten by Mongol Tartars.

Website/Catalog  (1935)  Page(s) 19.  
 
May-Flowering Pæonies.
Herbaceous species and varieties.
Anomala. Bright scarlet-crimson. Graceful finely cut foliage. In flower, May 8th....3/6

Website/Catalog  (1925)  Page(s) 40.  
 
Anomala. Brick-red, single with large yellow stamens. May-June.....1 piece M 2.-, 100 pieces M 180.-

Website/Catalog  (1921)  Page(s) 31.  
 
Single-blooming peonies...Anomala. Purple-pink, large-bloomed, early... 1 piece M 4.50, 100 pieces M 400.-

Website/Catalog  (1919)  Page(s) 37.  
 
Paeonia anomala. (Rare.) Blooms very early brick-red with large yellow bright stamens...10 pieces M 10.-, 100 pieces M 80.-

Book  (1917)  Page(s) 225.  
 
Anomala (unusual—referring to the leaves, which are finely divided). Siberia. Stated by some writers to be the same as P. Emodi, which it very evidently is not. First mentioned in Flora Siberica (St. Petersburg, 1747.) Flowers with irregular petals of a brilliant red and with clusters of yellow stamens. The roots grow to great size and are used by the Mongol Tartars for food.

Website/Catalog  (1910)  Page(s) 35.  
 
Early May Flowering Peonies
Anomala. A rare and graceful species, rose lilac flowers, foliage finely cut. 75¢.

Website/Catalog  (1910)  Page(s) 39.  
 
European herbaceous peony varieties.
Paeonia anomala, is a rare, pretty species with deeply incised foliage and single lilac-pink blooms. 1 piece M 1.50, 10 piexes M 14.-

Book  (1907)  Page(s) 25.  
 
159. ANOMALA, P Type Species.
(1) 1837, Hovey's Mag. Vol. 3, p. 287.
(2) 1886 The Garden, Vol. 29, p. 606.
(3) 1889, The Garden, Vol. 36, p. 9.
(4) 1894, The Garden Vol. 46, p. 104.
(5) 1899, Petere Barr & Son Cat.
(6) Cornell Plot No. 71.