Etymology: Caltha: old Greek and later Latin name for the marigold or "chalice" or "cup"
Plants: perennial, floating aquatic with slender stems
Leaves: kidney-shaped to widely heart-shaped, not divided
Flowers: pink to white, 5-9-parted, 1/3" wide, petal-like sepals; blooms July-Aug.
Habitat: cold ponds, slowly moving streams
Conservation Status: Endangered
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 10, Wetland Indicator = OBL WIS DNR-Bureau of Endangered Resources: Detailed information on Wisconsin listed species including state and federal status, photos, etc. Minnesota Dept. of Natural Resources: Rare Species Guide; description, conservation, photos, maps, etc. USDA Plants Database: Federal Distribution and detailed information including photos