Sambucus nigra
- Description of the Elder and photographs of flowers, leaves, berries and an off-the-ground tree.
- http://www.plant-identification.co.uk/skye/caprifoliaceae/sambucus-nigra.htm

Sambucus racemosa ssp. pubens
- Information on distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/shrub/samracp/

Sambucus cerulea
- Information on distribution and occurrence, value and use, characteristics, and fire ecology.
- http://www.fs.fed.us/database/feis/plants/shrub/samcer/

Sambucus mexicana
- image
- http://www.botany.hawaii.edu/faculty/carr/images/sam_mex_fl.jpg