| Peperomia zongolicana Jimeno-Sevilla & Verg.-Rodr., 2018 |
| Piper L., 1753 |
| Piper abalienatum Trel., 1921 |
| Piper achoteanum Trel., 1929 |
| Piper acuminatum Pers., 1805 |
| Piper acutiusculum C. DC., 1898 |
| Piper adamatum Trel. & Standl., 1952 |
| Piper aduncum L., 1753 |
| Piper aequale Vahl, 1797 |
| Piper aereum Trel., 1929 |
| Piper aeruginosibaccum Trel., 1929 |
| Piper aggregatum P.J. Bergius, 1772 |
| Piper alatum (Ruiz & Pav.) Vahl, 1804 |
| Piper albidiflorum C. DC., 1920 |
| Piper alpinum Sw., 1788 |
| Piper alushii Callejas, 2020 |
| Piper amalago L., 1753 |
| Piper andresense Trel., 1937 |
| Piper angustatum (Kunth) Poir., 1816 |
| Piper angustifolium Lam., 1791 |