| 1. pennyroyal [ Synonyms: mentha pulegium] | |
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Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil
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| 2. pennyroyal [ Synonyms: american pennyroyal, hedeoma pulegioides] | |
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Erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine
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