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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- Raban,
- Raffeneau-Delile, Alire,
- Rafinesque, C. S.
- Redouté, Henri Joseph.
- Redouté, Pierre Joseph,
- RedouteÌ, Henri-Joseph,
- RedouteÌ, Pierre Joseph,
- Reede tot Drakestein, Hendrik van,
- Reiche, Karl Friedrich,
- Reichenbach, H. G.
- Reichenbach, H. G. Ludwig
- Reid, Hugo.
- ReÌmond, N.
- Renauld, F.
- Rendle, A. B.
- Richard and Arthur Taylor.
- Richard, Achille,
- Ridgway, James
- Ridgways.
- Ridinger, Johann Elias,
- Rijksherbarium (Netherlands)
- Robert P. Smith.
- Robinson, Benjamin Lincoln,
- Rodrigues, J. Barbosa
- Römer, J. J.
- Römer, J. J.
- Roth, E.
- Rousseau, Jean-Jacques,
- Rowley, Gordon D.
- Roxburgh, William,
- Royal Botanic Gardens, Kew.
- Royen, Adrianus van,
- Royle, J. Forbes
- Ruiz, Hipólito,
- Rumpf, Georg Eberhard,
- Rung, Johan Daniel,
- Rusby, Henry Hurd,
- Ruysch, Frederik,
- Rydberg, Per Axel,