Etymology: Caltha: old Greek and later Latin name for the marigold or "chalice" or "cup"
Plants: erect, perennial, 8"-24" tall forb; stems hollow, branched toward the top
Leaves: widely heart-shaped, not divided; basal leaves long-stalked, stem leaves alternate and on shorter stalks
Flowers: yellow, 5-9-parted, 1/2"-1 1/2" wide, petal-like sepals; blooms April-May
Habitat: wet; meadows, woods, forests marshes, streambanks
Hazardous: Careful, this plant is hazardous!
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 6, Wetland Indicator = OBL Atlas of the Wisconsin Prairie and Savanna Flora: by T.S. Cochrane & H.H. Iltis: habitat, distribution infomation / flowering and fruiting times USDA Plants Database: Federal Distribution and detailed information including photos David G. Smith's "Delaware Wilflowers": Beautiful photographs; descriptions USGS - Northern Prairie Wildlife Research Center: Wetland Plants and Plant Communities of Minnesota and Wisconsin USDA Agricultural Research Service (ARS): Images of seeds, fruits, embryos, etc. Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"