R
- Rhamnus caroliniana
- Rhapidophyllum hystrix
- Rhododendron alabamensis
- Rhododendron austrinum
- Rhododendron carolinianum
- Rhododendron maximum
- Rhododendron minus
- Rhododendron nudiflorum
- Rhus glabra
- Rhus typhinia
- Robinia pseudoacacia
- Rosmarinus officinalis
Read more about this topic: Donald E. Davis Arboretum