Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sum-mŏnĕo (subm-), ŭi, 2, v. n., to remind privily, give a hint (very rare): summonuit me Parmeno, quod, etc., Ter. Eun. 3, 5, 22: patres salutavit nominatim singulos, nullo summonente, Suet. Aug. 53.