Mo. Rev. Stat. § 380.291

The plan of merger shall be submitted to a vote at a meeting of the members which may be either an annual or a special meeting. Written or printed notice stating that the purpose, or one of the purposes, of the meeting is to consider the plan of merger, together with a copy or a summary of the plan of merger, shall be given to each member entitled to vote at the meeting within the time and in the manner provided in the company's articles for the giving of notice of meetings of members.