1,104 titles (books/journals)
4,905 volumes
2,113,184 pages
232,055 links to protologues
Recent additions 
Botanicus is a freely accessible portal to historic botanical literature from the Missouri Botanical Garden Library.
Botanicus is made possible through support from the Institute of Museum and Library Services, W.M. Keck Foundation,
and the Andrew W. Mellon Foundation. Learn more...
- R. P. D.,
- Raban,
- Raffeneau-Delile, Alire,
- Rafinesque, C. S.
- Ransonnet-Villez, Eugen,
- Raphelengien, Franciscus,
- Raphelengien, Justus,
- Rāzī, Abū Bakr Muḥammad ibn Zakarīyā,
- Rea, John,
- Real Academia de la Historia (Spain)
- Reale accademia delle scienze di Torino.
- Redouté, Henri Joseph.
- Redouté, Pierre Joseph,
- Reede tot Drakestein, Hendrik van,
- Reeve Brothers.
- Reeve, Benham, and Reeve
- Reichard, Johann Jakob,
- 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,
- Roetter, Paulus,
- Röhling, Johann Christoph,
- Römer, J. J.
- Roosevelt-Rondon Scientific Expedition
- Roscoe, William,
- Roth, Albrecht Wilhelm,
- Roth, E.
- Roth, Georg,
- Rothrock, Joseph T.,
- Rottbøll, Christen Friis,
- Roulston, T'ai Honda.
- Roupell, Arabella,
- Rousseau, Jean-Jacques,
- Rousselon, Libraire-Éditeur.
- Rousselon.
- Rowley, Gordon D.
- Roxburgh, William,
- Royal Asiatic Society of Great Britain and Ireland.
- Royal Botanic Garden, Calcutta.
- Royal Botanic Garden, Edinburgh.
- Royal Botanic Gardens, Kew.
- Royal Society of South Australia
- Royal Society of Tasmania.
- 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,