From Richard Winger at Ballot Access News:
The Missouri Green Party, which is not ballot-qualified, is petitioning for party status this year. That petition needs 10,000 signatures and is due in late July. If the petition drive succeeds, the Green Party will be able to nominate by convention for any partisan race. In Missouri, the name of the Green Party is “Progressive Party.”
To date at least 2 candidates are planning to run for office with the Missouri Progressive Party, Midge Potts for US Senate and Nicholas Ivan Lavendorf for US House of Representatives (MO-7).