- Helianthus annuus - Image showing the flower in closeup, illustrating ray and disc florets, and the developing seeds.
www.botany.hawaii.edu/faculty/carr/images/hel_ann.jpg
- Helianthus tuberosus - A short description of the Jerusalem artichoke, including cultivation and medicinal uses.
www.botanical.com/botanical/mgmh/a/artic065.html
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