"Copihue or Chilean Bellflower, Lapageria rosea, The" - "Describes history, cultivation, and cultivars, also provides photographs."

"Poison Ivy, Oak & Sumac Information Center" - "Pictures of various poisonous plants with pictures. Includes facts, remedies, treatment, question and answers, and FAQs."

About.com: Trumpeting Trumpet Vines on the Landscape - Information about trumpet vines and how to attract hummingbirds with flowing vines.

Eastcheam Ivy - Contains information about different species of the plant along with photographs and resources.

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."

Ivyfile - "Ivy encyclopedia with cultivars, illustrations, and nursery sources."

Luffa.info - Information and photopgaphs about luffa sponge gourds.

Passion Flowers - Information about Passiflora collection with tips on growth and care in the UK climate.