John and Jacq's Garden (on archive.org) - Informational page provided by home gardeners in Malaysia with details on culture and propagation. (zone 8-11) (11 photos)
Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 10-11) (6 photos). Also a page for 'Zebrina'.
(1 photo)