R
- Gabriele Rabel
- Oliver Rackham
- Albert Ernest Radford
- Constantine Samuel Rafinesque
- John Ralfs
- Christen C. Raunkiær
- Leonhard Rauwolf
- Peter H. Raven
- John Ray
- Anton Rehmann
- Heinrich Gustav Reichenbach
- Ludwig Reichenbach
- Jose Restrepo
- Thekla Resvoll
- Hanna Resvoll-Holmsen
- Achille Richard
- Louis Claude Richard
- Henry Nicholas Ridley
- Augustus Quirinus Rivinus
- Harold E. Robinson
- Frans Hubert Edouard Arthur Walter Robyns
- Joseph Rock
- Lauritz Kolderup Rosenvinge
- Werner Rothmaler
- William Roxburgh
- Georg Eberhard Rumphius
- Per Axel Rydberg
Read more about this topic: List Of Botanists