Book  (Jan 1999)  Page(s) 32.  
 
Lemoine crossed P. wittmanniana with Chinese varieties to produce early-flowering peonies with large, fragrant single flowers in white, yellow, rose and salmon, with thick, luxuriant leaves such as 'Avant Garde', 'Le Printemps', 'Mai Fleuri' and 'Messagère'.

Website/Catalog  (1931)  Page(s) 42.  
 
 Pivoines précoces. Hybrides de P. sinensis et de P. Wittmanniana...Le printemps (L.); grandes fleurs, 6 ou 7 pétales, crème jaunâtre veiné, 10 mai ...10 fr.

Book  (1917)  Page(s) 92.  Includes photo(s).
 
Le Printemps. One of the Wittmanniana hybrids. Large flowers. A single row of thick, smoth petals pale yellow in colour. Stamens prominent. An exquisite flower. Keeps well when cut. See Chap. IV. Note illustration. Lemoine. Single. Pale yellow. Large. Early May. Medium height. Vigorous growth. Foliage large, distinct and beautiful in outline and colour, which is a light green. Cutting.

Book  (1917)  Page(s) 109.  
 
The Wittmaniana hybrids, however, are very hardy. M. Lemoine, the French hybridist, by making crosses of various Chinese varieties on P. Wittmaniana has produced these valuable extra early-flowering sorts. They have large fragrant single flowers of great beauty, in delicate tints of white, yellow, rose and salmon, and have thick leaves of vigorous and luxuriant growth. Avante Garde, palest rose; Le Printemps, yellowish cream ; Mai Fleuri, salmon white, and Messagere, sulphur white, are all most attractive.

Magazine  (1913)  Page(s) 16.  
 
....krautigen Paeonien, hat die gelbliche Witmanniana benutzt, um frühblühende Sorten zu ziehen (Avantgarde, Maifleuri, Le printemps, Messagère), welche die Herkunft von Witmanniana moch durch kleinere, nicht stark gefüllte Blumen und frühes Blühen anzeigen.
Translation:
...herbaceous peonies, used the yellowish Wittmanniana to obtain early-blooming sorts (Avantgarde, Maifleuri, Le printemps, Messagère), which demonstrate the descent from Wittmanniana through smaller, not very double blooms and early blooming.

Website/Catalog  (Aug 1910)  Page(s) 14-15.  
 
Pivoines hybrides du Pæonia sinensis croisé par le P. Wittmanniana
Ces plantes se distinguent de leur parents par une végétattion exubérante. La floraison commence vers le milieu du mois de mai, c'est-à-dire environ un mois avant les Pivoines de Chine; les fleurs sortant bien du feuillage, sont simples, de grand taille, du couleur claire, jaunâtre ou saumonée, et produisent, à cette époque hâtivede l'année, un charmant effetqui les fera sûrement rechercher des amateurs...

Le printemps (Lem.); feuillage vert clair, larges fleurs de 14 centimètres de diamètre, à 6-7 pétales jaune crème, étamines chrome, filets carmin violacé, stigmates carmin; floraison au 15 mai ....3 fr.

[not listed in the 1928-1930 catalogues, but again in 1931]

Website/Catalog  (1909)  Page(s) 7.  
 
LE PRINTEMPS. Foliage bright green, large flowers from six to seven petals, cream-yellow, stamens chrome, filaments violet-carmine, stigma. Blooms the middle of May...$ 4 00