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Race relations
2
Ramalina
7
Ranunculales
1
Relations with politicians
2
Research
2
Rhamnaceae
1
Rhynchospora
23
Rhynchostegium
2
Riccia
1
Ricciaceae
1
Riella
2
Riellaceae
2
Rorippa
7
Rosales
2
Rubiaceae
3
Ruellia
1
Rumex
16