423 titles (books/journals)
1,968 volumes
896,248 pages
175,045 links to protologues
Recent additions 
Botanicus is a freely accessible, Web-based encyclopedia of historic botanical literature from the Missouri Botanical Garden
Library. Botanicus is made possible through support from the W.M. Keck Foundation and the Andrew W. Mellon Foundation.
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- Pabst, G.
- Palisot de Beauvois, Ambrose-Marie-François-Joseph,
- Palmgrén, Carl Gustaf.
- Palmii, Jo. Jacobi.
- Pamplin, G.
- Paris, E. G.
- Parke, Davis & Company.
- Pavón, José,
- Perrottet, G. S.
- Persoon, C. H.
- Peter Schoeffer.
- Peterson, Peter Magnus.
- Philip Miller.
- Philippines.
- Pichard.
- Pieter van der Aa.
- Pirotam et Masperum.
- Piso, Willem,
- Planchon, J.-E.
- Plantijnsche Drukkerij
- Plumier, Charles,
- Poeppig, Eduard Friedrich,
- Pohl, Johann Emanuel,
- Poiret, Jean Louis Marie,
- Poiteau, A.
- Polet, C. B.
- Pona, Giovanni,
- Poot, Abraham van,
- Post, Thomas Erik von,
- Pottier.
- Power, Frederick B.
- Preiss, Ludwig.
- Presl, Karel BorÌŒiwog,
- Presl, Karel Bořiwog,
- Pritzel, G. A.
- Psilander, Fredrik Christopher,
- Pursh, Frederick,