Luffa.info
- Information and photopgaphs about luffa sponge gourds.
- http://www.luffa.info/

About.com: Trumpeting Trumpet Vines on the Landscape
- Information about trumpet vines and how to attract hummingbirds with flowing vines.
- http://landscaping.about.com/cs/groundcovervines/a/flowering_vines.htm

Hoya
- Tips on culture, germination and care. Information on the species history, native habitat and systematics. Contains a larger photo gallery with photos of flowers, whole plant and leaves.
- http://www.hoyor.net/

Poison Ivy, Oak & Sumac Information Center
- Pictures of various poisonous plants with pictures. Includes facts, remedies, treatment, question and answers, and FAQs.
- http://www.poisonivy.us/

Eastcheam Ivy
- Contains information about different species of the plant along with photographs and resources.
- http://www.eastcheam.co.uk

Passion Flowers
- Information about Passiflora collection with tips on growth and care in the UK climate.
- http://www.passionflow.co.uk