Climbers and Vines

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

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

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

Ivyfile
Ivy encyclopedia with cultivars, illustrations, and nursery sources.
http://members.tripod.com/~Hatch_L/hede1616.html

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

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

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/