I don't think so. "Fleur" would refer to a château with a fleur in the name, Like Ch. Lafleur (second wine Les Pensées-de-Lafleur). But I don't recall a (Château) Petite Fleur.
Sometimes you see Ch. La Fleur-Pétrus mentioned as "the second wine of Pétrus". Which of course is blasfemy, be it that they both belong to Moueix.