Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (9 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 4-8). Also a page for 'Nana'.
NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (1 photo)