1. (

• pennyroyal ,
• Mentha_pulegium

) Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil ;

2. (

• pennyroyal ,
• American_pennyroyal ,
• Hedeoma_pulegioides

) erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine ;