Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (13 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 5-6) (14 photos). Also a page for 'Rocky Top'.
Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 5-9) (4 photos)