Protasparagus africanus
- Accession information from the University of Connecticut.
- http://florawww.eeb.uconn.edu/acc_num/198502392.html

Asparagus officinalis
- A short description and medicinal uses.
- http://www.botanical.com/botanical/mgmh/a/aspar079.html

Protasparagus setaceus
- Record of the plant as grown at Connecticut.
- http://florawww.eeb.uconn.edu/acc_num/198500203.html

Protasparagus densiflorus `Sprengeri'
- Accession and general information from the University of Connecticut.
- http://florawww.eeb.uconn.edu/acc_num/198501207.html

Protasparagus densiflorus `Myerii'
- Information on the plant as grown at Connecticut University.
- http://florawww.eeb.uconn.edu/acc_num/198500204.html

Asparagus setaceus
- Magnified image of flowers.
- http://www.botany.hawaii.edu/faculty/carr/images/asp_set.jpg

Asparagus sprengeri
- Image of shoot carrying berries.
- http://www.dipbot.unict.it/orto/1072-1.html

Asparagus plumosus
- Image of flowering shoot.
- http://www.dipbot.unict.it/orto/0236-1.html

Asparagus exuvialis
- Photograph of the stem, foliage, and flowers.
- http://www.dipbot.unict.it/orto/0029-1.html

Asparagus acutifolius
- Images of the plant and flowers.
- http://www.dipbot.unict.it/orto/1112-1.html