Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Raphanus sativus (1 member)
- Raspberry (2 members)
- Recipes (0 members)
- Recreational drug use (1 member)
- Red algae (2 members)
- Red flowers (2 members)
- Red foliage (0 members)
- Red fruits (1 member)
- Redwood National Park (1 member)
- Renewable energy (1 member)
- Reproduction (1 member)
- Reproductive system (3 members)
- Republic of China (1 member)
- Resins (6 members)
- Rhamnaceae (7 members)
- Rhizome (0 members)
- Rhizophoreae (1 member)
- Rhodophyta (1 member)
- Rhumsiki (1 member)
- Rhus (1 member)
- Rhus vernix (1 member)
- Rice (10 members)
- Ricinus communis (1 member)
- Robinia pseudoacacia (4 members)
- Romanesco (1 member)
- Romneya (3 members)
- Roof Gardens (1 member)
- Root diagrams (1 member)
- Root vegetables (30 members)
- Roots (10 members)
- Rosa (3 members)
- Rosa Alba Group (1 member)
- Rosa Bourbon Group (1 member)
- Rosa Hybrid Gallica (2 members)
- Rosaceae (16 members)
- Rosales (3 members)
- Rosario (2 members)
- Rose hip (3 members)
- Roses (3 members)
- Roses in art (1 member)
- Rosmarinus officinalis (4 members)
- Royal Botanical Garden, Madrid (1 member)
- Rubiaceae (8 members)
- Rubus (7 members)
- Ruellia (33 members)
- Ruellia caroliniensis (1 member)
- Ruins in England (1 member)
- Rumex acetosa (1 member)
- Rural community development (2 members)
- Russian Empire (2 members)