775 titles (books/journals)
3,552 volumes
1,517,166 pages
207,200 links to protologues
Recent additions 
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- R. P. D.,
- Raban,
- Raffeneau-Delile, Alire,
- Rafinesque, C. S.
- Raphelengien, Franciscus,
- Raphelengien, Justus,
- Rāzī, Abū Bakr Muḥammad ibn Zakarīyā,
- Real Academia de la Historia (Spain)
- Redouté, Henri Joseph.
- Redouté, Pierre Joseph,
- Reede tot Drakestein, Hendrik van,
- Reeve Brothers.
- Reeve, Benham, and Reeve
- Reiche, Karl Friedrich,
- Reichenbach, H. G.
- Reichenbach, H. G. Ludwig
- Reid, Hugo.
- Reitt, W. N.
- Rémond, N.
- Renauld, F.
- Rendle, A. B.
- Repton, Humphry,
- Retzius, Anders Jåhan,
- Richard and Arthur Taylor.
- Richard, Achille,
- Richter, Karl,
- Ridgway, James
- Ridgways.
- Ridinger, Johann Elias,
- Rijksherbarium (Netherlands)
- Riocreux, Alfred,
- Ritter, Karl.
- Robert P. Smith.
- Robinson, Benjamin Lincoln,
- Rock, Joseph Francis Charles,
- Rodrigues, J. Barbosa
- Roeslin, Eucharius,
- Römer, J. J.
- Roth, Albrecht Wilhelm,
- Roth, E.
- Rottbøll, Christen Friis,
- Rousseau, Jean-Jacques,
- Rowley, Gordon D.
- Roxburgh, William,
- Royal Botanic Garden, Calcutta.
- Royal Botanic Gardens, Kew.
- Royen, Adrianus van,
- Royle, J. Forbes
- Roze, Ernest,
- Ruel, Jean,
- Ruiz, Hipólito,
- Rumpf, Georg Eberhard,
- Rümpler, Theodor,
- Rung, Johan Daniel,
- Rusby, Henry Hurd,
- Ruysch, Frederik,
- Rydberg, Per Axel,