Rhododendron ponticum
- Information on this invasive species and two photographs.
- http://www.plant-identification.co.uk/skye/ericaceae/rhododendron-ponticum.htm

Rhododendron maximum
- An account of the species, including distribution and occurrence, use and characteristics.
- http://www.fs.fed.us/database/feis/plants/shrub/rhomax/

Rhododendron macrophyllum
- Account of the species, including distribution and occurrence, use and characteristics.
- http://www.fs.fed.us/database/feis/plants/shrub/rhomac/

Rhododendron albiflorum
- Description and photograph of White Rhododendron in Washington state, USA.
- http://www.cwnp.org/photopgs/rdoc/rhalbiflorum.html

Rhododendron indicum
- Photograph of single flower.
- http://www.botany.hawaii.edu/faculty/carr/images/rho_ind.jpg

Rhododendron cubitii
- Collection information for this species at Connecticut University.
- http://florawww.eeb.uconn.edu/acc_num/198501342.html