Centranthus ruber: Valerian
- A number of photographs of this species, both red and white.
- http://www.hear.org/starr/hiplants/images/thumbnails/html/centranthus_ruber.htm

Centranthus ruber
- Photographs and a description of Red Valerian which often grows on walls and cliffs.
- http://www.plant-identification.co.uk/skye/valerianaceae/centranthus-ruber.htm