Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. per-sĕro, sēvi, 3, v. a., to sow or plant (post-class.): quod (semen) non persevit, Sid. Carm. 7, 386.
2. per-sĕro, ĕre, 3, v. a., to stick or run through (post-class.): resticulas per ficos maturas perserunt, Varr. R. R. 1, 41, 5.