Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
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) (2 photos). Also pages for 'Buttercup', 'Nestor', and 'Trehane'.
NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (1 photo)