P
- Peter Simon Pallas
- Edward Palmer
- Josif Pancic
- Filippo Parlatore
- Charles Christopher Parry
- William Paterson
- Ruth Patrick
- Ove Paulsen
- Richard Pearce
- Donald C. Peattie
- Jean-Marie Pelt
- Karl Julius Perleb
- Henri Perrier de la Bâthie
- Christian Hendrik Persoon
- Paul Petard
- James Petiver
- Rodolfo Amando Philippi
- Louis Alexandre Henri Joseph Piré
- Pliny the Elder
- Leonard Plukenet
- Eduard Friedrich Poeppig
- Joel Roberts Poinsett
- Alf Erling Porsild
- Morten Pedersen Porsild
- Eduard Pospichal
- George E. Post
- Jan Svatopluk Presl
- Karel Presl
- Cyrus Pringle
- Nathanael Pringsheim
- William Purdom
- Frederick Traugott Pursh
- Paul Émile de Puydt
- Henri François Pittier
Read more about this topic: List Of Botanists