It is shown that every conjunctive language is generated by a conjunctive grammar of a special form, in which every nonterminal A has at most one rule of the general form A ? a1&an, while the rest of the rules for A must be of the type A ? w, where w is a terminal string. For context-free grammars, a similar property does not hold (S. A. Greibach, W. Shi, S. Simonson, "Single tree grammars", 1992).