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 6-9) (7 photos). Also a page for 'Amazone'.
Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (1 photo)
Rainy Side Gardeners: Phlomis tuberosa 'Amazone' - Plant profile compiled by two gardeners in the Pacific Northwest. Includes propagation and pruning methods, and commentary. (zone 5-8) (2 photos)
Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 6) (3 photos)