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  (1941)  Page(s) 69.  
 
Various Peonies
We have grouped below several varieties. The first three are crosses between Chinese Peonies and Wittmanniana...They are all early flowering and extend the season of Peonies by two weeks.
Maifleuri. Delicate flesh-white, with a rich creamy-yellow over-color. Very fine.

Website/Catalog  (1936)  Page(s) 12.  
 
May-Flowering Pæonies.
Herbaceous species and varieties.
Single-flowered unless otherwise described.
Wittmanniana. Mayflower. Very beautiful, pure satiny white flushed slightly with peach when young; pale green carpels tipped carmine; medium to large flowers. 2½ feet....5/-

Website/Catalog  (1931)  Page(s) 42.  
 
 
Pivoines précoces. Hybrides de P. sinensis et de P. Wittmanniana...Mai fleuri (L.); grandes fleurs, blanc nuancé chair, 10 mai ...12 fr.

Book  (1917)  Page(s) 95.  
 
Mai Fleuri. One of the Wittmanniana hybrids. Large white flowers, tinted salmon-pink, and veined at base of petals with dark violet. See Chap. IV. Lemoine. Single. White. Large. Early May. Medium height. Fine strong foliage of bronze 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 sûrementrechercher des amateurs....

Mai fleuri (Lem.); feuillage vert bronzé ou purpurin, fleurs de 15 centimètres, blanc carné saumoné, quelques nervures roses, étamines jaune d'or, based de filets violet noir, floraison vers le 10 mai ...3 fr.

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