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

Derived forms: pennyroyals

Type of: herb, herbaceous plant, mint

Part of: genus Hedeoma, Hedeoma

Encyclopedia: Pennyroyal

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• alicyclic
• alicyclic compound