Caltha minor is a rhizomatous perennial in the buttercup family that bears star-shaped flowers in March to May. It favours moist habitats and produces heart- or kidney-shaped leaves. The blooms have no true petals; their coloured sepals — yellow to white — provide the floral display. Plants spread by short rhizomes to form low clumps.

Kingcup (Caltha minor) is a rhizomatous buttercup that favours moist ground and flowers from March to May.

Caltha is a genus of rhizomatous perennial flowering plants in the family Ranunculaceae, to which ten species have been assigned. They occur in moist environments in temperate and cold regions of both the Northern and Southern Hemispheres.

Caltha minor

Kingcup | Caltha minor

Caltha polypetala is a perennial in the buttercup family adapted to persist in wet, marshy ground. It grows where soil remains moist and benefits from humus-rich conditions. Place it in full sun to partial shade at pond margins or in bog gardens. It flowers from March to May, providing an early-season presence in wetland planting.

Giant marsh marigold (Caltha polypetala) thrives in wet, humus-rich soil at pond edges and flowers from March to May.